MU-NLPC/Calc-aqua_rat huggingface dataset:
Find the average of first 75 natural numbers? Choices:
A) 35
B) 38
C) 32
D) 36
E) 39

Solution: Sum of first 100 natural numbers = 75*76/2= 
75*76/2 = 2_850
2850Required average= 2850/75= 
2850/75 = 38
38Answer is 38
Answer: B
If the circus were to sell all of its 220 tickets for this month's performance at their usual price, the revenue from sales would be 10% greater than that collected last month. However, the circus raised the ticket price by 5% and sold only 200 tickets as a result. What percent less was last month's revenue than that of this month? Choose the correct choice from the following answers: A) 2 B) 5 C) 100/21 D) 110/20 E) 9/4

Solution: 220p = 1.1RL (220 tickets at regular P price = 1.1 (or 10% more) than revenue last month (RL)   to find RL just multiply each side by 10/11 (1.1*10 = 11/11= 
11/11 = 1
1)   220(10/11)p= 1.1(10/11)R:   200p = RL (so the revenue last month was = to 200p)   Now what does our revenue look like at the new ticket price this month:   200(1.05)P = 210p   so...if the revenue this month will be 210p, what percentage less was last months revenue at 200p than that of this month?   (210p-200p)/210p = 10p/210p = 1/21   we're looking for percentage though, so multiply this by 100   1/21(100) = 100/21   Answer 100/21
Answer: C
Working together, printer A and printer B would finish the task in 20 minutes. Printer A alone would finish the task in 60 minutes. How many pages does the task contain if printer B prints 4 pages a minute more than printer A ?
Choose the correct choice from the following answers:
A) 120
B) 180
C) 240
D) 280
E) 340

Solution: 20*A + 20*B = x pages   in 20 mins printer A will print = 20/60 * x pages = 1/3*x pages   thus in 20 mins printer printer B will print x - 1/3*x = 2/3*x pages   Also it is given that printer B prints 4 more pages per min that printer A. In 20 mins printer B will print 80 more pages than printer A   thus 2/3*x - 1/3*x = 80 => x = 240 pages   Answer: 240
Answer: C
The height of the wall is 6 times its width and length of the wall is 7 times its height .if the volume of the wall be 129024 cu.m.its width is  Choose the most appropriate option.
A) 4m
B) 5m
C) 6m
D) 7m
E) 8m

Solution: 8mxplanation:   Let width = x   Then, height=6x and length=42x   42x Ã— 6x Ã— x = 129024   x = 8   Answer: 8m
Answer: E
The average age of the district level hockey team of eleven is 35 years.The average age gets increased by 1 year when the coach age is also included.what is the age of the coach ? Choose the correct choice from the following answers:  A) 43 yrs.  B) 44 yrs.  C) 45 yrs.  D) 47 yrs.  E) 46 yrs.

Solution: Explanation:   Total age of players in team = 35 x 11 = 385   When coach is included, total members = 12, Avg age increases by one becomes 23   Total age when coach is included = 36x12 = 432   Age of coach = 432-385= 
432-385 = 47
47 yrs.   Answer:47 yrs.
Answer: D
P is four times as fast as Q and working together, they can complete a work in 20 days. In how many days can Q alone complete the work?
Choose the correct choice from the following answers
A) 35 days  B) 15 days  C) 16 days  D) 25 days  E) 18 days

Solution: P = 4Q   P + Q = 4Q + Q = 5Q   These 5Q people can do the work in 20 days, which means Q can do the work in 100 days.   Hence, P can do the work in 25 days.   ANSWER:25 days
Answer: D
The number of bacteria in a petri dish increased by 50 percent every 2 hours. If there were 108 million bacteria in the dish at 4: 00 p.m., at what time were there 32 million bacteria in the dish? Choices.
A) 6: 00 p.m.  B) 8: 00 p.m.  C) 10: 00 a.m.  D) 8: 00 a.m.  E) 11: 00 a.m.

Solution: Given:   he number of bacteria in a petri dish increased by 50 percent every 2 hours   There were 108 million bacteria in the dish at 4: 00 p.m   Since the bacteria is increasing by 50% every 2 hours, this means that the number is multiplied by 1.5 every 2 hours.   Required: At what time were there 32 million bacteria in the dish?   Assume that there were n intervals of 2 hours between 32 million and 108 million.   32 * (1.5)^n = 108   (3/2)^n = 108/32 = 27/8 = (3/2)^3   Hence n = 3 intervals.   Each interval was of 2 hours. Therefore, the number of hours = 6   Subtracting 6 hours from 4 PM, we get 10 AM as the answer.   Option 10: 00 a.m.
Answer: C
20% of a 6 litre solution and 60% of 4 litre solution are mixed. What percentage of the mixture of solution
Choose the correct choice from the following choices.
A) 36%  B) 35%  C) 34%  D) 33%  E) 32%

Solution: 20% of 6 litre is  (6*20/100)= 
 (6*20/100) = 6/5 = around 1.2
1.2 litre   60% of 4 litre is  (60*4/100)= 
 (60*4/100) = 12/5 = around 2.4
2.4 litre   the mixture is 3.6 litre   so the percentage is  (3.6*100/10)= 
  (3.6*100/10) = 36
36%   36%NSWER:36%
Answer: A
Suresh can complete a job in 15 hours. Ashutosh alone can complete the same job in 25 hours. Suresh works for 9 hours and then the remaining job is completed by Ashutosh. How many hours will it take Ashutosh to complete the remaining job alone? Choose the correct choice from the following answers
A) 4
B) 5
C) 6
D) 10
E) None of these

Solution: The part of job that Suresh completes in 9 hours   = 9â„15 = 3â„5   Remaining job = 1 - 3â„5 = 2â„5   Remaining job can be done by Ashutosh in 2â„5 Ã— 25 = 10 hours   Answer 10
Answer: D
Which of the following lists the no. of points at which a circle can intersect a square ? Choose the correct choice
A) 2 & 8 only
B) 2, 4 & 8 only
C) 2, 4, 6 & 8 only
D) 1, 2, 3, 4, 6 & 8 only
E) 1, 2, 3, 4, 5, 6, 7 & 8 only

Solution: Soln:   Tangent intersects the circle at exactly one point ,All the points are possible.   1, 2, 3, 4, 5, 6, 7 & 8 only   ANSW1, 2, 3, 4, 5, 6, 7 & 8 onlyR:1, 2, 3, 4, 5, 6, 7 & 8 only
Answer: E
Out of 12 employs of a bank, one employ retires and his place, a new employ of age 24 years joins as a result average age of employs reduces by 4 years. The age of the retired employ is:  Choose the most appropriate option:
A) 72	B) 74	C) 78	D) 79	E) 60

Solution: 72   Option '72'
Answer: A
A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Choose the most appropriate option.
A) 40 sec
B) 42 sec
C) 45 sec
D) 48 sec
E) 60 sec

Solution: Formula for converting from km/hr to m/s: X km/hr =[ X *( 5/18) ]m/s.   Therefore, Speed =[ 45 x( 5/18) m/sec=( 25/2 )m/sec.   Total distance to be covered = (360 + 140)= 
(360 + 140) = 500
500 m.   Formula for finding Time=( Distance/Speed )   Required time = [ (500 x 2)/25 ] sec = 40 sec.   40 secnswer:40 sec
Answer: A
A fort had provision of food for 150 men for 45 days. After 10 days, 25 men left the fort. Find out the number of days for which the remaining food will last.	Choose the correct choice from the following options:
A) 44
B) 42
C) 40
D) 38
E) 36

Solution: Explanation:   Given that fort had provision of food for 150 men for 45 days   Hence, after 10 days, the remaining food is sufficient for 150 men for 35 days   Remaining men after 10 days = 150 - 25= 
150 - 25 = 125
125   Assume that after 10 days, the remaining food is sufficient for 125 men for x days   More men, Less days (Indirect Proportion)   (men) 150 : 125 :: x : 35   ⇒150×35=125x   ⇒6×35=5x   ⇒x=6×7=42   i.e., the remaining food is sufficient for 125 men for 42 days   Answer: Option 42
Answer: B
20,180,9120,40880,501370 which number is wrong in series  Choose the correct option
A) 20	B) 9120	C) 501370	D) 180	E) 40880

Solution: 501370...........   all are multiples of 20 expect 501370   ANSWER:501370
Answer: C
A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, the volume of the box (in m3) is:  Answers:
A) 4830
B) 5120
C) 6420
D) 7500
E) 8960

Solution: l = (48 - 16)= 
(48 - 16) = 32
32 m,   b= (36 -16)= 
(36 -16) = 20
20 m,   h= 8 m.   Volume of the box = (32 x 20 x 8) m3 = 5120 m3.   Answer: Option 5120
Answer: B
Three people (1 couple and 1 single) are seated at random in a row of 6 chairs. What is the probability that the couple does not sit together?  Answers.
A) 2/3  B) 4/5  C) 2/7  D) 3/5  E) 5/12

Solution: The total number of arrangements of 3 people is   6*5*4= 
  6*5*4 = 120
120   Let's think of the couple as a single unit.   The number of arrangements when the couple sits together is 5*4*2= 
5*4*2 = 40
40.   Note that we multiply by 2 because the couple can switch places with each other.   The number of ways the couple won't sit together is  120 - 40= 
 120 - 40 = 80
80   P(couple won't sit together)= 80/120 = 2/3   The answer is 2/3.
Answer: A
A leak in the bottom of a tank can empty the full tank in 8 hours. An inlet pipe fills water at the rate of 6 litres a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 12 hours. How many litres does the cistern hold?  Choose the correct choice from the following answers:
A) 7580
B) 7960
C) 8290
D) 8640
E) none

Solution: Sol.   Work done by the inlet in 1 hour = (1/8 - 1/12) = 1/24.   Work done by the inlet in 1 hour = (1/24 x 1/60) = 1/1440.   ∴ Volume of 1/1440 part = 6 litres.   ∴ Volume of whole = (1440 x 6) litres = 8640 litres.   Answer 8640
Answer: D
Ratio of the earnings of A and B is 4:7. If the earnings of A increases by 50% and those of B decreased by 25%, the new ratio of their earnings becomes 8:7. What are A's earnings?
Pick one
A) 8:5
B) 8:8
C) 8:3
D) 8:7
E) 8:1

Solution: Let the original earnings of A and B be Rs. 4x and Rs. 7x.   New earnings of A = 150% 0f Rs. 4x = (150/100 * 4x) = Rs. 6x   New earnings of B = 75% of Rs. 7x = (75/100 * 7x) = Rs. 21x/4   6x:21x/4 = 8:7   This does not give x. So, the given data is inadequate.   Answer:8:7
Answer: D
A and B together invested Rs. 9,000 in a business. At the end of the year, out of total profit is Rs. 3,000 B's share was Rs. 1500. A's investment was  Choose the correct choice from the following
A) s. 4,500
B) s. 8,250
C) s. 10,500
D) s. 11,250
E) s. 12,250

Solution: s. 4,500+B=9000   total profit=3000   3000-1500= 
3000-1500 = 1_500
1500   1500;1500=1:1   then   1*9000/2= 
  1*9000/2 = 4_500
4500   s. 4,500NSWER:s. 4,500
Answer: A
The average salary of a person for the months of January, February, March and April is Rs.8000 and that for the months February, March, April and May is Rs.8500. If his salary for the month of May is Rs.6500, find his salary for the month of January?	Select the correct option:
A) Rs.4500
B) Rs.4557
C) Rs.4509
D) Rs.4526
E) Rs.4513

Solution: Sum of the salaries of the person for the months of January, February, March and April = 4 * 8000= 
4 * 8000 = 32_000
32000 ----(1)   Sum of the salaries of the person for the months of February, March, April and May= 4 * 8500= 
4 * 8500 = 34_000
34000 ----(2)   (2)-(1) i.e. May - Jan= 2000   Salary of May is Rs.6500   Salary of January = Rs.4500   Rs.4500nswer:Rs.4500
Answer: A
n^(n/2)=6 is true when n=6 in the same way what is the value of n if n^(n/2) =9?  Answers.
A) 16  B) 14  C) 18  D) 6  E) 9

Solution: n^(n/2)=9Apply logN/2logn=log9nlogn=2log9=log9^2=log81Logn=log81Now apply antilogn=81/nNow n=9.ANSW9R:9
Answer: E
An inspector rejects 0.000008% of the meters as defective. How many will be examine to project ?  Select the correct option:
A) 2000  B) 2300  C) 2700  D) 25000000  E) 250

Solution: Let the number of meters to be examined be x.   Then, 0.000008% of x =2   [(8/1000000)*(1/100)*x] = 2   x = [(2*1000000*100)/8= 
(2*1000000*100)/8 = 25_000_000
25000000   Answer is 25000000.
Answer: D
A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are drawn what is the probability that one is yellow and two are red?  Choose the correct option:
A) P(E)=12/455 B) 12/458 C) 12/487 D) 12/456 E) 12/4512

Solution: Given that there are three blue marbles, four red marbles, six green marbles and two yellow marbles.   When three marbles are drawn , the probability that one is yellow and two are red   = (2 * 4 * 3 * 3 * 2)/(1 * 2 * 15 * 14 * 13)   = 12/455   P(E)=12/455nswer:P(E)=12/455
Answer: A
The speed of light is approximately 93 * 10^4 miles per second. This approximate speed is how many miles per hour?
Choose the correct choice from the following options:  A) 1,11 * 10^7  B) 3,35 * 10^6  C) 1,11 * 10^8  D) 1,86 * 10^8  E) 3,35 * 10^7

Solution: The easiest way to answer this question is by POE, it does not require any calculation (answered in 30seconds). In one hour there are 3600 seconds, therefore speed in miles/hour will be.   (.93*10^4)*3600 = (.93*10^4)*(3.6*10^3) = some number*10^7...   The key is realizing that thesome numberhas to be bigger thatn .93(because .93*3.6), and the only answer that fits that is 3,35 * 10^7.
Answer: E
In a certain town, there are four times as many people who were born in the town’s state as there are people who were born in another state or country. The ratio of those residents born in the town’s state to the town’s total population is
Choose the correct choice from the following choices:	A) 1 to 4	B) 1 to 3	C) 1 to 2	D) 3 to 4	E) . 4 to 5

Solution: Town state: 4 times the whole town or country   then ratio will be 4(times)/5 total(times)   So the answer is 4/5.   ANSW. 4 to 5R:. 4 to 5
Answer: E
The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?  Select
A) 29	B) 78	C) 30	D) 28	E) 12

Solution: 20 + 24 + 8 * 2= 
20 + 24 + 8 * 2 = 60
60/2= 
60/2 = 30
30   Answer: 30
Answer: C
Set A = {1, 2, 3, 4, 5, 6, w}
Which of the following possible values for w would cause Set A to have the smallest standard deviation?
Select the correct option:
A) 1	B) 2.5	C) 3	D) 3.5	E) 7

Solution: I agree. The mean of the set w=1,2,3,4,5,6 is 3.5 . Now if we add one extra number to the set, in order for the standard deviation to be minimum, that number must be as close as possible to the original set (1,2,3,4,5,6). Therefore we have to choose the number closest to 3,5 from the options we have, leaving D as the best choice.   Answer 3.5.
Answer: D
In how many ways can the letters of the word REPEAT be arranged? Options:
A) 2580 B) 360 C) 2000 D) 2520 E) 3420

Solution: REPEAT has 6 words, but E is repeated two times. Thus ways = 6! / 2! = 360ways   360
Answer: B
If 3 : 7 :: x : 21, then find the value of x
Choose the correct option
A) 7
B) 8
C) 11
D) 6
E) 9

Solution: 9xplanation:Treat 3:7 as 3/7 and x:21 as x/21, treat :: as = So we get 3/7 = x/21=> 7x = 63=> x = 9 Option 9
Answer: E
A train is 360 meter long is running at a speed of 45 km/hour. In what time will it pass a bridge of 140 meter length? Choose the correct choice from the following answers.
A) 11 seconds	B) 38 seconds	C) 40 seconds	D) 88 seconds	E) 19 seconds

Solution: Speed = 45 Km/hr = 45*(5/18) m/sec = 25/2 m/sec   Total distance = 360+140= 
360+140 = 500
500 meter   Time= Distance/speed   = 500 * (2/25)= 
500 * (2/25) = 40
40 seconds   Answer: 40 seconds
Answer: C
A 2-year certificate of deposit is purchased for A dollars. If the certificate earns interest at a n annual rate of 6 percent compound quarterly, which of the following represents the value, in dollars, of the certificate at the end of 2 years?  Choices
A) A(1.06)^2
B) A(1.06)^8
C) A(1.015)^2
D) A(1.015)^8
E) k(1.03)^4

Solution: Annual Rate of interest= 6%   Quaterly rate of interest= 6/4= 
6/4 = 3/2 = around 1.5
1.5%   Now, periods of compounding in 2 years= 8 (8 quarters)   Thus A(1.015)^8   Answer: A(1.015)^8
Answer: D
At a meeting of the 8 Joint Chiefs of Staff, the Chief of Naval Operations does not want to sit next to the Chief of the National Guard Bureau. How many ways can the 8 Chiefs of Staff be seated around a circular table? Options:
A) 120 B) 480 C) 960 D) 2520 E) 5080

Solution: Bunuel, I'm also a little confused with the number of arrangements of n distinct objects in a circle. Why is it given by (n-1)!. In theveritasanswer they say:answer E (5080), should be the number of ways to arrange all 7 without the seating restriction given. Is this incorrect?5080
Answer: E
The amount of principal Rs.8000 at compound interest at the ratio of 5% p.a. for 6 years is  Choose the correct choice from the following options.
A) s.9621	B) s.6921	C) s.10721	D) s.6261	E) s.6361

Solution: c.i=p(1+r/100)^n   =8000(1+5/100)^6   =Rs10721   ANSWER:s.10721
Answer: C
A customer went to a shop and paid a total of $40, out of which 90 cents was for sales tax on taxable purchases. If the tax rate was 6%, then what was the cost of the tax free items? Pick one
A) $22.70
B) $23.20
C) $24.10
D) $25.50
E) $26.90

Solution: The total cost was $40.   The tax was $0.90   Let the original price of the taxable items = x   Given that tax rate = 6%   0.06x = 0.90   x = $15   The cost of the tax free items was $40 - $15 - $0.90 = $24.10   The answer is $24.10.40 -  15 -  0.90= 
40 -  15 -  0.90 = 24.1
$24.10   The answer is $24.10.
Answer: C
A cricketer has certain average for 10 innings. In the 11 inning he scored 108 runs, there by increasing his average by 6 runs. His new average is	Choose one:  A) 30  B) 50  C) 42  D) 62  E) 80

Solution: Let the average for 10 innings be x   Then, (10x+108)/11 = x+6   x = 42   Answer is 42
Answer: C
If n + 10 is a positive odd integer, which of the following must be true about the sum of the next four integers?	Options:
A) It is a multiple of 3
B) It is a multiple of 4
C) It is a prime number
D) It is a multiple of 5
E) It is a multiple of 2

Solution: n+10 is a positive odd integer. This means n will be an odd integer   The next 4 integers would be: n + 10, n + 11, n + 12, n + 13   Sum = 4n + 46   This sum will always be even.   Option It is a multiple of 2
Answer: E
Last week Vartan spent 20 percent of his wages on recreation. This week, his wages are 20 percent less than last weekʼs wages and he spent 40 percent of his wages on recreation. The amount he spends on recreation this week is what percent of the amount he spent on recreation last week?  Select the correct option:
A) 150%  B) 170%  C) 175%  D) 160%  E) 180%

Solution: Say Vartan's wages last week were $100, so he spent  0.20*100= 
 0.20*100 = 20
$20 on recreation;   This week's wages is 0.8*100= 
0.8*100 = 80
$80, so he spends   0.4*80= 
  0.4*80 = 32
$32 on recreation;   32/20= 
32/20 = 8/5 = around 1.6
1.6, hence the amount he spends on recreation this week is 160% of the amount he spent on recreation last week:   20*1.6= 
  20*1.6 = 32
32   Answer: 160%
Answer: D
A van takes 5 hours to cover a distance of 465 km. What speed in kph should the van maintain to cover the same distance in 3/2 of the previous time?
Choose the correct choice from the following options: A) 56 B) 58 C) 60 D) 62 E) 64

Solution: (3/2)*5= 
(3/2)*5 = 15/2 = around 7.5
7.5 hours   465 / 7.5= 
465 / 7.5 = 62
62 kph   The answer is 62.
Answer: D
The apartment on King-Williams street is an asset that its value is tramping about. From the year 1973 to 1983 it's value decreased by 16% and from 1983 to 1993 it's value increased by 16%. What is the value of the asset in 1993 if in 1973 it was worth $45,000?  Choose the correct choice from the following answers
A) $43,848.  B) $40,000.  C) $38,976.  D) $39,679.  E) $36,796.

Solution: 45,000 *1.16*.84= 43,848   $43,848.nswer $43,848.
Answer: A
The first doughnut is priced at $1 and then if you purchase additional doughnuts as dozens then the price is $6/dozen. What is the total number of doughnuts purchased if you paid $20?
Choose the correct choice from the following choices
A) 30	B) 32	C) 34	D) 36	E) 38

Solution: $20 = 3 * $6 + $2   The number of doughnuts is 3*12 + 2= 
3*12 + 2 = 38
38   The answer is 38.
Answer: E
P, Q and R have Rs.5000 among themselves. R has two-thirds of the total amount with P and Q. Find the amount with R?
Choose the correct choice from the following answers:	A) Rs.3000	B) Rs.3600	C) Rs.2000	D) Rs.4000	E) None of these

Solution: Let the amount with R be Rs.r   r = 2/3 (total amount with P and Q)   r = 2/3(5000 - r) => 3r = 10000 - 2r   => 5r = 10000 => r = 2000.   ANSWER:Rs.2000
Answer: C
If 4w^4 − 41w^2 + 100 = 0, then what is the sum of the two greatest possible values of w ? Answers.
A) 4 B) 9/2 C) 7 D) 41/4 E) 25

Solution: just forget about the value of w^4 for the moment and let w^2= X. (its better to work with power of 2 than 4)   now we have equation as 4x^2 -41x +100 =0, factoring them gives us 4X^2 -16x -25x +100 =0. which can be solved as (4x-25)(x-4) , so x= 4 and 25/4.   so w^2 = 4 and 25/4   so w= +2 and minus 2 and +5/2 and minus 5/2   The two greatest values are +2 and +5/2. so their sum 2+5/2 =9/2 = 9/2
Answer: B
15 men can complete a piece of work in 30 days. In how many days can 10 men complete that piece of work? Choose the correct answer
A) 45 B) 50 C) 34 D) 27 E) 11

Solution: 15 * 30 = 10 * x => x = 45 days   45nswer:45
Answer: A
If A,B,C are three integers and AB+C is even ; which of the following must be true?
A)C is even
B)B is even
C)AB is even	Choose the correct answer
A) I only	B) II only	C) III only	D) II,III only	E) None of the above

Solution: If AB is Odd then C will not even. O+E = O   If B is even AB is even always. But If C is Odd None of the above+O = O   None of the above are true
Answer: E
If the price of petrol increases by 25% and Benson intends to spend only an additional 15% on petrol, by how much % will he reduce the quantity of petrol purchased? Select the correct option.
A) 8%	B) 7%	C) 10%	D) 6%	E) 9%

Solution: Explanation:   8%ssume that the initial price of 1 Litre petrol = Rs.100 ,Benson spends Rs.100 for petrol,   such that Benson buys 1 litre of petrol   8%fter the increase by 25%, price of 1 Litre petrol = 100 × (100+25)/100 = Rs.125   Since Benson spends additional 15% on petrol,   amount spent by Benson = 100× (100+15)/100 = Rs.115   Hence Quantity of petrol that he can purchase = 115/125 Litre   Quantity of petrol reduced = (1−115/125) Litre   Percentage Quantity of reduction = (1−115125)/1 × 100 = 10/125 × 100 = 105 × 4 = 2 × 4 = 8%   8%nswer: Option 8%
Answer: A
The L.C.M of two numbers is 2310 and their H.C.F is 30. If one number is 770 the Other is
Select the correct option.
A) 330
B) 90
C) 270
D) 250
E) 350

Solution: The other number   = L.C.M * H.C.F/given number   = 2310*30/770= 
2310*30/770 = 90
90   Answer is 90.
Answer: B
Calculate the number of bricks, each measuring 25 cm x 15 cm x 8 cm required to construct a wall of dimensions 10 m x 4 cm x 6 m when 10% of its volume is occupied by mortar ?
Choose the correct answer:
A) 720	B) 600	C) 660	D) 6000	E) 650

Solution: Explanation:   Let the number of bricks be 'N'   10 x 4/100 x 6 x 90/100 = 25/100 x 15/100 x 8/100 x N   10 x 4 x 6 x 90 = 15 x 2 x N => N = 720.   720NSWER IS 720
Answer: A
Ramu rides his bike at an average speed of 45 km/hr and reaches his desitination in four hours. Somu covers the same distance in five hours. If Ramu covered his journey at an average speed which was 9 km/hr less and Somu covered his journey at an average speed which was 10 km/hr more, then the difference in their times taken to reach the destination would be (in minutes).
Choose the correct choice from the following.
A) 65 minutes B) 66 min C) 56 minutes D) 69 minutes E) 46 minutes

Solution: Distance travelled by Ramu = 45 * 4= 
45 * 4 = 180
180 km   Somu travelled the same distance in 5 hours.   His speed= 180/5= 
180/5 = 36
36 km/hr   Hence in the conditional case, Ramu's speed= 45 - 9= 
45 - 9 = 36
36 km/hr and Somu's speed= 36 + 10= 
36 + 10 = 46
46km/hr.   Therefore travel time of Ramu and Somu would be 5 hours and 3.9 hours respectively. Hence difference in the time taken= 1.1 hours = 66 minutes.   ANSWER:66 min
Answer: B
Two machines, Y and Z, work at constant rates producing identical items. Machine Y produces 5 items in the same time Machine Z produces 2 items. If machine Y takes 9 minutes to produce a batch of items, how many minutes does it take for machine Z to produce the same number of items?	Choose one: A) 6 B) 9 C) 9 1/2 D) 22.5 E) 13 1/2

Solution: rate z/rate y=2/5   time z/time y=5/2   5/2*9= 
5/2*9 = 45/2 = around 22.5
22.5 minutes   22.5
Answer: D