RikoteMaster/aqua-rat-mcqa huggingface dataset:
Question: Fry ship’s pirates have obtained 100 gold coins and have to divide up the loot. The pirates are all extremely intelligent, treacherous and selfish (especially the captain).
The captain always proposes a distribution of the loot. All pirates vote on the proposal, and if half the crew or more go “Aye”, the loot is divided as proposed, as no pirate would be willing to take on the captain without superior force on their side.
If the captain fails to obtain support of at least half his crew (which includes himself), he faces a mutiny, and all pirates will turn against him and make him walk the plank. The pirates start over again with the next senior pirate as captain.
What is the maximum number of coins the captain can keep without risking his life?
A.98
B.77
C.55
D.39
Answer: A.98
Explanation: A
98 Coins
The captain says he will take 98 coins, and will give one coin to the third most senior pirate and another coin to the most junior pirate. He then explains his decision in a manner like this…
If there were 2 pirates, pirate 2 being the most senior, he would just vote for himself and that would be 50% of the vote, so he’s obviously going to keep all the money for himself.
If there were 3 pirates, pirate 3 has to convince at least one other person to join in his plan. Pirate 3 would take 99 gold coins and give 1 coin to pirate 1. Pirate 1 knows if he does not vote for pirate 3, then he gets nothing, so obviously is going to vote for this plan.
If there were 4 pirates, pirate 4 would give 1 coin to pirate 2, and pirate 2 knows if he does not vote for pirate 4, then he gets nothing, so obviously is going to vote for this plan.
As there are 5 pirates, pirates 1 & 3 had obviously better vote for the captain, or they face choosing nothing or risking death.
Question: Sam purchased 20 dozens of toys at the rate of Rs. 375 per dozen. He sold each one of them at the rate of Rs. 33. What was his percentage profit?
A.3.5
B.4.5
C.5.6 percent
D.6.5
Answer: C.5.6 percent
Explanation: Solution
C.P of 1 toy	= Rs.(375/12)
= Rs.31.25
S.P of 1 toy	= Rs.33.
Therefore,Profit	= (1.75/31.25×100)%
=(28/5)%
=5.6%.
Answer C
Question: 9log9(6) = ?
A.1
B.6
C.3
D.4
Answer: B.6
Explanation: Exponential and log functions are inverse of each other. Hence
aloga(x) = x , for all x real and positive.
and therefore
9log9(6) = 6
correct answer B
Question: What is the probability of rolling five six-sided dice, and getting a different number on each die?
A.1/12
B.1/3
C.4/9
D.5/54
Answer: D.5/54
Explanation: MAGOOSHOFFICIAL SOLUTION
For the first die, we can roll any one of six numbers. For the second die, we can roll any number save for the number we rolled on the first die, giving us 5 possibilities. For the third die, we can roll four different numbers (we can’t roll the number we rolled on the first or second die.
6 x 5 x 4x3x2 = 720 possibilities out of 216 total possibilities. (For total possibilities we get 6 x 6 x 6x6x6 = 6^5).
720/6^5 =5/54
Answer: D.
Question: Mary's income is 60% more Than Tim's income and Tim's income is 20% less than Juan's income.What % of Juan's income is Mary's income.
A.128%
B.B.120%
C.96%
D.80%
Answer: A.128%
Explanation: Even I got 96%
J = 100
T = 100*0.8 = 80
M = 80*1.6 = 128
If Mary's income is x percent of J
M = J*x/100
x = M*100/J = 128*100/100 = 128
Ans:A
Question: A bag of P peanuts can be divided into 9 smaller bags with 6 peanuts left over. Another bag of M peanuts can be divided into 12 smaller bags with 4 peanuts left over. Which of the following is the remainder when PM is divided by 18?
A.4
B.6
C.3
D.2
Answer: B.6
Explanation: P = 9x + 6
M = 12y + 4
PM = (9x + 6)*(12y + 4) = 108xy + 36x + 72y + 24
Remainder of nm/18 = (108xy + 36x + 72y + 24)/18
Observe that the first three terms are a multiple of 18
24 when divided by 18 leaves remainder 6
Hence mn/18 will leave remainder 6
Correct Option: B
Question: Martin bought 10 concert tickets, some at the full price of $2.00 per ticket, and some at a discounted price of $1.60 per ticket. If he spent a total of $18.40, how many discounted tickets did he buy?
A.3
B.4
C.5
D.6
Answer: B.4
Explanation: Let x be the number of tickets he bought at $2 per ticket.
then 2 x + (10-x)1.6 = 18.4
0.4x = 2.4 => x = 6
discounted tickets = 10 -x = 4
Ans : B
Question: A farm has only chickens and pigs. When the manager of the farm counted the heads of the animals on the farm, the number totaled up to 70. When the number of legs was counted, the number totaled up to 204. How many more chickens than pigs are there on the farm? Note: Each pig has 4 legs and each chicken had 2 legs.
A.4
B.5
C.6
D.7
Answer: C.6
Explanation: Let x be the number of chickens.
Then 70-x is the number of pigs.
2x+4(70-x)=204
2x=76
x=38 (chickens)
70-x=32 (pigs)
There are 38-32=6 more chickens on the farm.
The answer is C.
Question: The average height of 50 pupils in a class is 155 cm. Five of them whose height is 146 cm, leave the class and five others whose average height is 156 cm, join. The new average height of the pupils of the class (in cm) is ?
A.156 cm
B.151 cm
C.276 cm
D.287 cm
Answer: A.156 cm
Explanation: Total height = 155 * 50 = 7750 cm.
New average = [7750 - 5 * 146 + 5 * 156 ] / 50
= 156 cm.
Answer:A
Question: There are 2 available positions and 50 candidates, one half of whom are democrats and another half are republicans. If it was decided that the positions would be filled at random, then what is the probability R that the both positions will be taken by members of just one party?
A.1/25
B.12/49
C.1/4
D.24/49
Answer: D.24/49
Explanation: R probability of one party having both spots:
(1/2) * (24/49) = 12/49
(1/2) or (25/50) because it does not matter which party or which person gets the first spot. (24/49) because after one person from a particular party is chosen, there are 24 members of the same party left out of 49 total candidates.
Since this result can happen for both parties, (12/49) + (12/49) = (24/49)
Answer: D
Question: A can do a work in 60 days. He works for 15 days and later B alone completes the work in 30 days. In what time will they together complete the work?
A.24 days
B.25 days
C.30 days
D.32 days
Answer: A.24 days
Explanation: let A can do a work in = 1/60 days
he does 15 days so work done by A in 15 days= (15) * (1/60) = 1/4
remaining work is = 1- 1/4= 3/4
B's one day work is =1/30
so 3/4 work is done by B in=(3/4) * (1/30) = 1/40 days
time require to complete the work is= 1/60 + 1/40 = 5/120
5/120 = 1/24
so 24 days require to complete the work together.
ANSWER:A
Question: If P represents the product of the first 14 positive integers, then P is not a
multiple of:
A.a) 99
B.b) 84
C.c) 51
D.d) 65
Answer: C.c) 51
Explanation: a) 99 = 9*11
b) 84 = 4*7*3
c) 51 =17*3
d) 65 = 5*13
e) 57 =19*3
since 17 is not there in first 15 positive numbers it is the only possibility
C
Question: A batsman makes a score of 90 runs in the 11th inning and thus increases his average by 5. Find his average after 11th inning.
A.40
B.50
C.62
D.45
Answer: A.40
Explanation: Let the average after 11th inning = x
Then, average after 10th inning = x-5
10(x-5)+90 = 11x
x = 90-50 = 40
Answer is A
Question: What is the remainder when 2990990900032 is divided by 32 ?
A.16
B.8
C.4
D.0
Answer: D.0
Explanation: Though i was unaware of the divisibility test for 32 but i guessed the pattern!!
divisibility rule for 4- last two digits must be divisible by 4
divisibility rule for 8- last three digits must be divisible by 8
similarly, divisibility rule for 32 - last five digits must be divisible by 32
Hence, Ans D
Question: A certain drink of type A is prepared by mixing 4 parts milk with 3 parts fruit juice. Another drink of type B is prepared by mixing 4 parts of fruit juice and 3 parts of milk. How many liters of fruit juice must be added to 84 liters of drink A to convert it to drink B?
A.24
B.28
C.32
D.36
Answer: B.28
Explanation: In 84 liters of drink A, there are 48 liters of milk and 36 liters of juice.
With 48 liters of milk, we need a total of 64 liters of juice to make drink B.
We need to add 28 liters of juice.
The answer is B.
Question: What is (16^7+16) / 16?
A.15467118
B.16777217
C.17827343
D.18047455
Answer: B.16777217
Explanation: (16^7+16) / 16 =
16*(16^6+1) / 16 =
16^6 + 1
Clearly this is a number which ends with a 7 in the units place.
The answer is B.
Question: If an integer n is to be selected at random from 1 to 100, inclusive, what is probability n(n+1) will be divisible by 16?
A.1/4
B.1/8
C.1/2
D.2/3
Answer: B.1/8
Explanation: because n(n+1) is always an even product of even*odd or odd*even factors,
there is a probability of 1 that that it will be divisible by 2,
and, thus, a probability of 1/2 that it will be divisible by 4
and, thus, a probability of 1/4 that it will be divisible by 8
and, thus, a probability of 1/8 that it will be divisible by 16
1*1/8=1/8
Answer : B
Question: If A=x^4 + y^4 = 100, then the greatest possible value of x is between
A.0 and 3
B.3 and 6
C.6 and 9
D.9 and 12
Answer: B.3 and 6
Explanation: My attempt:
If A=x^4+y^4=100, then the greatest possible value of x would be when y is minimum.
Let y^4 be 0. Now x^4 = 100. x should be definitely greater than 3 but less than 4. The only option that fits this range is B
Hence answer is --
b) 3 and 6.
Question: What is the 4 digit number in which the 1st digit is 1/3 of the second, the 3rd is the sum of the 1st and 2nd, and the last is three times the second?
A.1243
B.1345
C.1349
D.1456
Answer: C.1349
Explanation: First digit is 1/3 second digit => The numbers can be 1 & 3, 2& 6, 3 & 9.
First + second = third => we can eliminate 3 & 9 since 3 + 9 = 12.
Last is 3 times the second => we can eliminate option 2 & 6 since 3 * 6 = 18.
Hence the number is 1349
C
Question: What is the ratio between perimeters of two squares one having 3 times the diagonal then the other?
A.3:6
B.3:9
C.3:2
D.3:1
Answer: D.3:1
Explanation: d = 3d d = d
a√2 = 3d a√2 = d
a = 3d/√2 a = d/√2
=> 3: 1
Answer:D
Question: A can do a work in 6 days. B can do the same work in 12 days. If both A & B are working together in how many days they will finish the work?
A.3
B.5
C.4
D.2
Answer: C.4
Explanation: A rate = 1/6
B rate = 1/12
(A+B) rate = (1/6)+(1/12) = 1/4
A & B finish the work in 4days
correct option is C
Question: If 10 ounces of a strong vinegar solution are diluted with 50 ounces of water to form a five-percent vinegar solution, what was the concentration of the original solution?
A.25%
B.28%
C.30%
D.32%
Answer: C.30%
Explanation: Let x be the concentration of the original solution.
10x = 0.05(60)
x = 0.3
The answer is C.
Question: If y is 40% greater than x, than x is what % less than y?
A.24.4%
B.28.6%
C.32.3%
D.36.5%
Answer: B.28.6%
Explanation: y = 1.4x
x = y/1.4 = 10y/14 = 5y/7
x is 2/7 less which is 28.6% less than y.
The answer is B.
Question: Lionel left his house and walked towards Walt's house, 48 miles away. Four hours later, Walt left his house and ran towards Lionel's house. If Lionel's speed was 2 miles per hour and Walt's 6 miles per hour, how many miles had Lionel walked when he met Walt?
A.12
B.18
C.20
D.24
Answer: B.18
Explanation: In the first 4 hours Lionel at the rate of 2 miles per hour covered distance=rate*time=4*2=8 miles. So, the distance between him and Walt was 48-8=40 miles when Walt left his house. Now, their combined rate to cover this distance was 2+6=8 miles per hour, hence they will meet (they will cover that distance) in time=distance/rate=40/8=5 hours. Total time that Lionel was walking is 4+5=9 hours, which means that he covered in that time interval distance=rate*time=2*9=18 miles.
Answer: B.
Question: At what price must an article costing Rs.38 be marked in order that after deducting 5% from the list price. It may be sold at a profit of 25% on the cost price?
A.52.5
B.50
C.62.3
D.62.1
Answer: B.50
Explanation: CP = 38
SP = 38*(125/100) = 38
MP*(95/100) = 47.5
MP = 50
Answer:B
Question: If x = 3k, where k is a prime number greater than 2, how many different positive even divisors does x have, including x?
A.0
B.1
C.2
D.3
Answer: A.0
Explanation: k is prime greater than 2 thus k is odd
3k is odd
Thus no even factors
Ans:A
Question: Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A.4.2
B.4.4
C.4.7
D.5.1
Answer: C.4.7
Explanation: Explanation: In this simple addition series, each number increases by 0.8.
Answer: Option C
Question: How many words, with or without meaning, can be formed using all letters of the word RED using each letter exactly once?
A.6
B.7
C.8
D.9
Answer: A.6
Explanation: The Word RED has exactly 3 letters which are all different.
Therefore the number of words that can be formed = Number of permutations of 3 letters taken all at a time.
= P (3, 3) = 3!
= 3 x 2 × 1
= 6
ANSWER:A
Question: Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 50% of Mary and John’s combined income?
A. $3,000
B. $4,000
C. $7,000
D. $11,000
Answer: A. $3,000
Explanation: Let Mary's income increase by x, then the equation will be
15,000 + x= (50 /100)* (15,000 + x + 18000 )
15,000 + x = (1/2) * (33,000 + x)
30,000 + 2x = x+ 33,000
x =3,000
So, Answer will be A
Question: The price of an item is discounted 10 percent on day 1 of a sale. On day 2, the item is discounted another 20 percent, and on day 3, it is discounted an additional 40 percent. The price of the item on day 3 is what percentage of the sale price on day 1?
A.28%
B.48%
C.64.8%
D.70%
Answer: B.48%
Explanation: Let initial price be 1000
Price in day 1 after 10% discount = 900
Price in day 2 after 20% discount = 720
Price in day 3 after 40% discount = 432
So, Price in day 3 as percentage of the sale price on day 1 will be = 432/900*100 => 48%
Answer will definitely be (B)
Question: At a certain conference, 150 students spoke one or more of the following languages: Spanish, English, and French. If 43 students spoke Spanish, 90 spoke English, 65 spoke French, and 32 spoke only 2 languages, how many students spoke three different languages?
A.7
B.8
C.12
D.15
Answer: B.8
Explanation: 150=43+90+65-32-2x
x=8
B. 8
Question: A man can row upstream at 10kmph and downstream at 18 kmph. The speed of the stream is
A.2.5 km/hr
B.4 km/hr
C.5 km/hr
D.10.5 km/hr
Answer: B.4 km/hr
Explanation: Sol.
Speed of stream = 1/2(18 -10) kmph = 4 kmph.
Answer B
Question: If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 45x and 20y?
A.5
B.5(x-y)
C.20x
D.20y
Answer: C.20x
Explanation: We are looking for a choice that CANNOT be the greatest common divisor of 45x and 20y ...which means 45x and 20y when divided by the answer choice the quotient should not be a integer.
lets check
a. 5 45x/5 = 9x and 20y/5 = 4y both are integers so eliminate
b. 5(x-y) when x = 2 and y = 1 it could be be the greatest common divisor ..so eliminate
c. 20x when x = 1 its 20 and 20 cannot be the greatest common divisor of 435x and 20y ...
or 45x/20x = 9/4 which is not a integer.
so answer is C.
Question: Of the two-digit positive integers that have no digits equal to zero, how many have two digits that are equal to each other and the remaining digit different from the other two?
A.24
B.9
C.72
D.144
Answer: B.9
Explanation: Of the two-digit positive integers that have no digits equal to zero, how many have two digits that are equal to each other and the remaining digit different from the other two?
A. 24
B. 36
C. 72
D. 144
E. 216
Choosing the digit for X - 9 ways;
# of permutations of 3 digits in XX -2!/2!
Total: 9*2!/2!=9.
Answer: B.
Question: A certain company retirement plan has arule of 70provision that allows an employee to retire when the employee's age plus years of employment with the company total at least 70. In what year could a female employee hired in 1986 on her 30nd birthday first be eligible to retire under this provision?
A.2003
B.2004
C.2005
D.2006
Answer: D.2006
Explanation: She must gain at least 70 points, now she has 30 and every year gives her two more points: one for age and one for additional year of employment, so 30 + 2*(# of years) = 70 --> (# of years) = 20 --> 1986+20=2006.
Answer: D.
Question: 5/6 of the lights bulbs on a string of all red christmas lights will light up. Then Fred replaced 1/2 of the dead bulbs with green bulbs. What fraction of the lights that light up are green?
A.1/11
B.1/6
C.2/11
D.1/12
Answer: A.1/11
Explanation: If there are 12 bulbs on the string of lights, that would mean 10 of the lights lit red and 2 of the bulbs were dead. If Fred replaced half of the dead light bulbs with green light bulbs, he would have replaced 1 dead light bulb with a green light bulb. This light bulb would be 1 of 11 functioning light bulbs or 1/11. (Answer: A)
Question: If there are 30 red and blue marbles in a jar, and the ratio of red to blue marbles is 6:4, what is the probability that, drawing twice, you will select two red marbles if you return the marbles after each draw?
A.1/25
B.2/25
C.3/25
D.4/25
Answer: B.2/25
Explanation: 30 red and blue marbles in a jar, and the ratio of red to blue marbles is 6:4
So, 10x=30 ---> x=3
Red marbles = 2*x = 2*3 = 6
Blue marbles = 3*x = 3*3 = 9
Prob to select a red marble = 6/30 = 1/5
Prob to select 2 red marbles with replacement = 1/5*2*5 = 2/25
Hence, answer will be B.
Question: The purchase price of an article is $48. In order to include 10% of cost for overhead and to provide $12 of net profit, the markup should be
A.15%
B.25%
C.35%
D.40%
Answer: C.35%
Explanation: Cost price of article = 48$
% of overhead cost = 10
Net profit = 12 $
We need to calculate % markup
Net profit as % of cost price = (12/48)*100 = 25%
Total markup should be = 25 + 10 = 35%
Answer C
Question: A and B invests Rs.4000 and Rs.4000 respectively in a business. If A doubles his capital after 6 months. In what ratio should A and B divide that year's profit?
A.3:5
B.3:8
C.3:2
D.9:9
Answer: C.3:2
Explanation: (4*6 + 8*6): (4*12)
72:48 =>
3:2
Answer:C
Question: When 1/10 percent of 7,000 is subtracted from 1/10 of 7,000, the difference is
A. 0
B. 50
C. 450
D. 693
Answer: D. 693
Explanation: We can break this problem into two parts:
1) What is 1/10 percent of 7,000?
2) What is 1/10 of 7,000?
To calculate 1/10 percent of 7,000 we must first remember to DIVIDE 1/10 BY 100.
So we have: (1/10)/(100)
To divide a number by 100 means to multiply it by 1/100, so we have:
1/10 x 1/100 = 1/1,000
Thus, 1/10 percent of 7,000 = 1/1,000 x 7,000 = 7.
Now let's concentrate on part 2. We need to calculate 1/10 of 7,000. To do this we simply multiply 1/10 by 7,000.
1/10 x 7,000 = 700
The answer to part 1 is 7, and the answer to part 2 is 700. Their difference is 700 – 7 = 693.
Answer D.
Question: In a triangle if the length of sides are as given below which one will not form triangle?
A.(5,5,5)
B.(5,4,5)
C.(4,4,9)
D.(3,4,5)
Answer: C.(4,4,9)
Explanation: using property :"sum of two side of a triangle is greater than its third side (4+4) is not greater than 9,so ans c
ANSWER:C
Question: The tax on a commodity is diminished by 24% but its consumption is increased by 12%. Find the decrease percent in the revenue derived from it?
A.20%
B.18%
C.15%
D.12%
Answer: C.15%
Explanation: 100 * 100 = 10000
76 * 112 = 8512
10000------- 1488
100 ------- ? = 15%
ANSWER:C
Question: If the average (arithmetic mean) of (2a+16) and (3a-8) is 79, what is the value of a?
A.25
B.30
C.28
D.36
Answer: B.30
Explanation: ((2a+16) + (3a-8)) / 2 = (5a+8)/2 = 79
a= 30
The answer is B.
Question: At an election 2 candidates are participated and a candidate got 20% of votes and defeated by 500. and 10 votes are invalid. Find the total polled votes?
A.843
B.1023
C.965
D.413
Answer: A.843
Explanation: Winner votes = 100-20 = 80
polled votes = [(100*500)/2*80-100]+10 = 843 (approximately)
Answer is A
Question: If a certain sample of data has a mean of 24.0 and a standard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?
A.12.0
B.13.5
C.17.0
D.23.5
Answer: C.17.0
Explanation: Value ismore than 2.5SDfrom the mean means that the distance between the mean and the value must be more than 2.5*SD=7.5. So the value must be either less than 24-7.5=16.5or more than 24+7.5=31.5.
Answer: C.
Question: The H.C.F of two numbers is 17 and their L.C.M is 5134. If one of the numbers is 289, then the other is?
A.302
B.304
C.306
D.308
Answer: A.302
Explanation: Other number = (17 * 5134)/289
= 302.
Answer: A
Question: The speed at which a girl can row a boat in still water is 75 kmph. If he rows downstream, where the speed of current is 15 kmph, what time will he take to cover 300 metres?
A.16
B.17
C.18
D.19
Answer: A.16
Explanation: Speed of the boat downstream = 75 + 15 = 90 kmph
= 90 * 5/18 = 25 m/s
Hence time taken to cover 400 m = 400/25 = 16 seconds. Answer: A
Question: A man can do a piece of work in 6 days, but with the help of his son he can do it in 3 days. In what time can the son do it alone ?
A.7 days
B.6 days
C.5 days
D.4 days
Answer: B.6 days
Explanation: Explanation:
In this type of question, where we have one person work and together work done. Then we can easily
get the other person work just by subtracting them. As
Son's one day work =
(1/3−1/6)=(6−3)/18=1/6
So son will do whole work in 6 days
Answer: B
Question: 6/7 of a certain number is 96. Find quarter of that number.
A.112
B.32
C.56
D.28
Answer: D.28
Explanation: Explanation:
6/7x = 96
x = 112
y = x/4 = 112/4 = 28
ANSWER D
Question: Two trains of equal length, running with the speeds of 60 and 40 kmph, take 50 seconds to cross each other while they are running in the same direction. What time will they take to cross each other if they are running in opposite directions?
A.10 sec
B.17 sec
C.99 sec
D.90 sec
Answer: A.10 sec
Explanation: RS = 60 -40 = 20 * 5/18 = 100/18
T = 50
D = 50 * 100/18 = 2500/9
RS = 60 + 40 = 100 * 5/18
T = 2500/9 * 18/500 = 10 sec
Answer:A
Question: Using all the letters of the word "HEAD", how many words can be formed, which begin with H and end with D?
A.8
B.4
C.2
D.7
Answer: C.2
Explanation: There are five letters in the given word.
Consider 4 blanks ....
The first blank and last blank must be filled with H and D all the remaining three blanks can be filled with the remaining 2 letters in 2! ways.
The number of words = 2! = 2.
Answer:C
Question: One side of a rectangular field is 13 m and one of its diagonal is 17 m. Find the area of the field.
A.100
B.141.7
C.150
D.180
Answer: B.141.7
Explanation: Solution
Other side = √(17)2 - (13)2
= √289 - 169
= √120
= 10.9 m.
∴ Area = (13 x 10.9)m2 = 141.7 m2.
Answer B
Question: How many positive integers of three different digits, each less than 400 can be formed from the digits 1, 2, 3, 4, 5 and 6?
A.30
B.60
C.90
D.120
Answer: B.60
Explanation: For the # to be < 400 the 100s digit shud be < 4 => one out of 3 choices 1/2/3
if the 100s digit is 1 then 10s digit can be selected in 5C1 and the units digit can be selected in 4C1 ways ==> 5C1*4C1=20
the same is the case with 2 and 3 too.
hence answer is 20+20+20 = 60
ANSWER:B
Question: A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 240 m long?
A.40
B.99
C.48
D.77
Answer: C.48
Explanation: :
Speed = 45 * 5/18 = 25/2 m/sec
Total distance covered = 360 + 240 = 600 m
Required time = 600 * 2/25 = 48 sec
Answer:C
Question: The cross-section of a cannel is a trapezium in shape. If the cannel is 10 m wide at the top and 6 m wide at the bottom and the area of cross-section is 640 sq m, the depth of cannel is?
A.29
B.27
C.27
D.80
Answer: D.80
Explanation: 1/2 * d (10 + 6) = 640
d = 80
Answer:D
Question: Elena purchased Brand X pens for $5.00 apiece and brand Y for $2.80 apiece. If Elena purchased a total of 12 of these pens for $42.00, how many brand X pens did she purchase?
A.4
B.5
C.6
D.7
Answer: C.6
Explanation: 4x+2.8y=42 --> multiply by 2.5 (to get the integers) --> 10x+7y=105 --> only one positive integers solutions x=6 and y=5 (how to solve: 7y must have the last digit of 5 in order the last digit of the sum to be 5).
Answer: C.
Question: A reduction of 40% in the price of oil enables a house wife to obtain 5kgs more for Rs.800, what is the reduced price for kg?
A.80
B.72
C.64
D.56
Answer: C.64
Explanation: 800*(40/100) = 320 ---- 5
? ---- 1 => Rs.64
Answer: C