RikoteMaster/aqua-rat-mcqa huggingface dataset:
Question: he number of sequences in which 9 players can throw a ball, so that the youngest player may not be the last is?
A.432881
B.322560
C.432020
D.288212
Answer: B.322560
Explanation: x Not younger_______ ↑
The last ball can be thrown by any of the remaining 8 players. The first 8 players can throw the ball in 8p8 ways.
The required number of ways = 8(8!) = 322560
Answer:B
Question: In a sports club with 55 members, 23 play badminton and 29 play tennis and 7 do not play either. How many members play both badminton and tennis?
A.3
B.5
C.4
D.7
Answer: C.4
Explanation: 23+29=52
but where as total number is 55-7=48
therefore answer is 52-48=4
Hence Answer is C
Question: A sum of Rs.4800 is invested at a compound interest for three years, the rate of interest being 10% p.a., 20% p.a. and 25% p.a. for the 1st, 2nd and the 3rd years respectively. Find the interest received at the end of the three years.
A.Rs.3178
B.Rs.3120
C.Rs.3127
D.Rs.3121
Answer: B.Rs.3120
Explanation: Explanation:
Let A be the amount received at the end of the three years.
A = 4800[1 + 10/100][1 + 20/100][1 + 25/100]
A = (4800 * 11 * 6 * 5)/(10 * 5 * 4)
A = Rs.7920
So the interest = 7920 - 4800 = Rs.3120
Answer: B
Question: An article is bought for Rs.675 and sold for Rs.900, find the gain percent?
A.33 1/9%
B.33 8/3%
C.33 1/3%
D.33 2/3%
Answer: C.33 1/3%
Explanation: 675 ---- 225
100 ---- ? => 33 1/3%
Answer: C
Question: A = {2, 3, 4, 5}
B = {4, 5, 6, 7, 8}
Two integers will be randomly selected from the sets above, one integer from set A and one integer from set B. What is the probability M that the sum of the two integers will equal 9 ?
A. 0.15
B. 0.20
C. 0.25
D. 0.30
Answer: B. 0.20
Explanation: Rearrange the first set:
A = {5,4,3,2}
B = {4,5,6,7, 8}
As you can see numbers in each column (the numbers of the same color) give the sum of 9. So there are 4 such pares possible, total # of pairs is 4*5=20.M=favorable/total=4/20=0.2.
Answer: B.
Or: we can select ANY number from set A (4/4=1) but in this case we must select its matching pair from set B (the number of the same color) and since there are only one matching pair of this particular number in B then the probability of this is 1/5. So, overall: M=1*1/5.
Answer: B.
Question: A number when divided by 342 gives a remainder 47. When the same number ift divided by 19, what would be the remainder ?
A.7
B.8
C.9
D.21
Answer: C.9
Explanation: Sol. On dividing the given number by 342, let k be the quotient and 47 as remainder.
Then, number – 342k + 47 = (19 x 18k + 19 x 2 + 9) = 19 (18k + 2) + 9.
The given number when divided by 19, gives (18k + 2) as quotient and 9 as remainder.
Option C
Question: All of the citizens of a country have a six-character or seven-character national identification code that is created using the 26 letters of the alphabet and the 10 digits from 0 to 9. What is the maximum number of citizens who can be designated with these codes?
A.36^13
B.35(36^7)
C.37(36^6)
D.35(36^6)
Answer: C.37(36^6)
Explanation: The number of possible 6-digit codes is 36^6.
The number of possible 7-digit codes is 36^7.
The total sum is 36^6 + 36^7 = 36^6(1+36) = 37(36^6)
The answer is C.
Question: 72519 x 9999 = ?
A.728727481
B.725117481
C.725189201
D.725173920
Answer: B.725117481
Explanation: B
725117481
72519 x 9999 = 72519 x (10000 - 1)
= 72519 x 10000 - 72519 x 1
= 725190000 - 72519
= 725117481.
Question: If 2x +3y = 30 and (x+y)/y = 11/8, then find the value of 5y + 6x
A.76
B.58
C.99
D.26
Answer: B.58
Explanation: Explanation:
The given equations are :
2x + 3y = 30 --------- (i)
and, (x+y)/y = 11/8
8x + 8y = 11y
8x – 3y =0 ----(ii)
Adding (i) & (ii), we get : 10 x = 30 or x = 3.
Put x = 3 in (i), we get : y = 8
Therefore, 5y + 6x = (5 * 8 + 6 * 3) = 40 + 18 = 58.
ANSWER: B
Question: 30 men can do a work in 40 days. When should 15 men leave the work so that the entire work is completed in 40 days after they leave the work?
A.87 days
B.10 days
C.15 days
D.44 days
Answer: C.15 days
Explanation: Total work to be done = 30 * 40 = 1200
Let 15 men leave the work after 'P' days, so that the remaining work is completed in 40 days after they leave the work.
40P + (15 * 40) = 1200
40P = 600 => P = 15 days
Answer:C
Question: Rajesh spends 40% of his monthly salary on food, 20% of the medicines and saves 60% of the remaining amount. If his monthly salary is Rs.15,000, how much money does he save every month ?
A.Rs.1000
B.Rs.2596
C.Rs.4320
D.Rs.6489
Answer: C.Rs.4320
Explanation: Explanation:
Ramesh's monthly income = Rs.15,000
He spends 40% on food.
The total money spent on food = 40/100 * 15000 = Rs. 6000
Now, his monthly remaining income = Rs.15000 – Rs.6000 = Rs. 9000
Out of Rs. 9000, he spends 20% on medicines.
The total money spent on medicines = 20/100 * 9000 = Rs.1800
Now, his monthly remaining income = Rs.9000 – Rs.1800 = Rs. 7200
Out of Rs. 7200, he saves 600%.
Amount saved = 60/100 * 7200 = RS.4320
ANSWER:C
Question: There are 4 books on fairy tales, 5 novels and 3 plays. In how many ways can you arrange these so that books on fairy tales are together, novels are together and plays are together and in the order, books on fairy tales, novels and plays.
A.17280
B.1900
C.21548
D.36554
Answer: A.17280
Explanation: There are 4 books on fairy tales and they have to be put together. They can be arranged in 4! ways. Similarly, there are 5 novels. They can be arranged in 5! ways. And there are 3 plays. They can be arranged in 3! ways. So, by the counting principle all of them together can be arranged in 4!*5!*3!= 17280 ways
Answer A
Question: A lady bought five books namely A,B,C,D,E to distribute her 2 children. How many ways she can distribute books?
A.3^3
B.3^4
C.2^5
D.3^6
Answer: C.2^5
Explanation: 2*2*2*2*2
2^5
ANSWER:C
Question: A man's speed with the current is 18 km/hr and the speed of the current is 3.4 km/hr. The man's speed against the current is
A.9
B.10.4
C.11.2
D.12.5
Answer: C.11.2
Explanation: Man's rate in still water = (18 - 3.4) km/hr = 14.6 km/hr.
Man's rate against the current = (14.6 - 3.4) km/hr = 11.2 km/hr.
Answer:C
Question: A trade analyst announced 15% reduction in the unit price of bike. As a result, the sales volume went up by 15%. What was the net effect on the sales revenue?
A.no change
B.decreases by 6.5%
C.increases by 6.5%
D.increases by 5.6%
Answer: B.decreases by 6.5%
Explanation: Explanation :
Reduction of price = (100 -15)% = 85% = 0.85
Increase of sale = (100+15)% = 115% = 1.15
Total effect = 0.85 X 1.15 = 93.5%, Decreases by 6.5%
Answer :B
Question: A train 350 m long is running at a speed of 68 kmph. How long does it take to pass a man who is running at 8 kmph in the same direction as the train?
A.5 sec
B.9 sec
C.12 sec
D.21 sec
Answer: D.21 sec
Explanation: Speed of the train relative to man = (68 - 8) kmph
= (60* 5/18) m/sec = (50/3)m/sec
Time taken by the train to cross the man
= Time taken by It to cover 350 m at 50/3 m / sec
= 350 *3/ 50 sec = 21sec
Answer : D
Question: An alloy of copper and zinc contains copper and zinc in the ratio 5 : 3. Another alloy of copper and zinc contains copper and zinc in the ratio 1 : 7. In what ratio should the two alloys be mixed so that the resultant alloy contains equal proportions of copper and zinc?
A.1 : 5
B.7 : 3
C.5 : 3
D.3 : 1
Answer: D.3 : 1
Explanation: Alloy-1: Copper: Zinc = 5:3, Let Quantity = x
i.e. Copper in Alloy-1 = [5/(5+3)]*x = (5/8)x
and Zinc in Alloy-1 = [3/(5+3)]*x = (3/8)x
Alloy-2: Copper: Zinc = 1:7, Let Quantity = y
i.e. Copper in Alloy-2 = [1/(1+7)]*y = (1/8)y
and Zinc in Alloy-1 = [7/(1+7)]*y = (7/8)y
After Combining the two alloys
Copper = (5/8)x + (1/8)y
Zinc = (3/8)x + (7/8)y
Now, (5x + y)/8 = (3x + 7y)/8
i.e. 2x = 6y
i.e. x = 3y
i.e. x/y = 3/1
Answer: option D
Question: In a consumer survey, 85% of those surveyed liked at least one of three products: 1, 2, and 3. 50% of those asked liked product 1, 30% liked product 2, and 16% liked product 3. If 5% of the people in the survey liked all three of the products, what percentage of the survey participants liked more than one of the three products?
A.6
B.10
C.15
D.20
Answer: A.6
Explanation: Use the forumla ;
Total = Group1 + Group2 + Group3 - (sum of 2-group overlaps) - 2*(all three) + Neither
100 = 50 + 30 + 16 - ( sum of 2) -2(5) +15
100 = 101-( sum of 2)
1 = sum of 2
so more than 1 = 6
A
Question: A sum of Rs. 125000 amounts to Rs. 17500 in 4 years at the rate of simple interest. What is the rate of interest?
A.10%
B.4%
C.5%
D.6%
Answer: A.10%
Explanation: S.I. = (17500 - 12500) = Rs. 5000\
Rate = (100 * 5000) / (12500 * 4) = 10%
ANSWER:A
Question: Find the compound interest on $1200 for 1year at 20% p.a. if CI is component yearly?
A.$120
B.$150
C.$240
D.$250
Answer: C.$240
Explanation: A = P(1 + R/100)^T
= 1200(1 + 20/100)^1
= 1200*6/5
=$1440
CI = A-P = 1440-1200 = $240
Answer is C
Question: If GAVE is coded as 5137 and BAT is coded as 924. How is GATE coded?
A.5147
B.5247
C.6584
D.7489
Answer: A.5147
Explanation: g-5 a-1 e-7 from the code gate
t - 4 from bat
ANSWER:A
Question: 6!/(6-3)!=?
A.120
B.346
C.356
D.366
Answer: A.120
Explanation: 6!/6-3)!=6!/3!=6*5*4=120. Hence, the correct answer is A.
Question: The monthly rent of a shop of dimension 20feet × 15feet is Rs.3600. What is the annual rent per square foot of the shop?
A.43
B.144
C.68
D.87
Answer: B.144
Explanation: Sol. Monthly rent per square feet = 3600/(20*15) = 12
& Annual rent per square feet
=12*12=144
Answer : B
Question: Diane find 3 and a half cans of paint are just enough to paint one third of her room. How many more cans of paint will she need to finish her room and paint a second room of the same size?
A.5
B.17 and a half
C.10
D.12 and a half
Answer: B.17 and a half
Explanation: She will need 7 cans to paint the rest of this room and 10 1/2 for the next room for a total of 17 1/2 cans.
B
Question: What is the product of the prime factors of 27 and the prime factors of 121?
A.3676
B.3762
C.3627
D.3267
Answer: D.3267
Explanation: The prime factors of 27 are 3*3*3
The prime factors of 121 are 11*11
3*3*3*11*11 =27*121= 3267. D is the correct answer
Question: A dice has one of the first 8 prime number on each its six sides ,with no two sides having the same number .the dice is rolled 10 times and the results added.the addition is most likely to be closet to
A.41
B.48
C.96
D.90
Answer: C.96
Explanation: if die is rolled then avg score = (2+3+5+7+11+13+17+19 )/8 = 77/8
so, most likely sum for 10 times = 77/8 * 10 = 96
ANSWER:C
Question: By approximately what percent is x greater than 4/5 if (4/5)(x) = 1?
A.73%
B.56%
C.41%
D.37%
Answer: B.56%
Explanation: 4/5= 80%, 5/4=125% increase by 45 percentage points 45/80=56% , hence B
Question: The cash realised on selling a 14% stock is Rs.108.25, brokerage being 1/4% is
A.123
B.106
C.108
D.156
Answer: C.108
Explanation: Explanation:
Cash realised= Rs. (108.25 - 0.25)
= Rs. 108.
Answer: C
Question: If the number obtained on interchanging the digits of a two digit number is 18 more than the original number and the sum of the digits is 8, then what is the original number?
A.25
B.30
C.35
D.40
Answer: C.35
Explanation: Sol.
Let ten's digit = x.
Then, unit's digit = (8-x).
∴ [10 (8-x)+x] - [10x + (8-x)] = 18
⇔ 18x = 54
⇔x = 3
So, ten's digit = 3 and units digit = 5.
Hence, original number = 35.
Answer C
Question: If y = q/6 + r/6^2 + s/2^5, where q, r, and r are each equal to 1 or 0, then y could be any of the values below EXCEPT:
A.9/8
B.7/32
C.1/4
D.5/16
Answer: D.5/16
Explanation: y = q/6 + r/6^2 + s/2^5
= q/6 + r/36 + s/32
= (36q + 6r + s ) /32
Depending on whether q, r and r take 0 or 1 :
substitute 0 or 1 for the different values of q, r and r.
Answer D
Question: 2 men and 7 boys can do a piece of work in 14 days; 3 men and 8 boys can do the same in 11 days. Then, 8 men and 6 boys can do three times the amount of this work in
A.05
B.21
C.51
D.11
Answer: B.21
Explanation: (2x14)men+(7x14)boys=(3x11)men+(8x11)boys
5 men= 10 boys 1man= 2 boys
Therefore (2 men+ 7 boys) = (2 x 2 +7) boys = 11 boys
( 8 men + 6 boys) = (8 x 2 +6) boys = 22 boys.
Let the required number of days be x.
More boys , Less days (Indirect proportion)
More work , More days (Direct proportion)
Boys 22:11 and Work 1:3=:14:x
Therefore, (22x1x)=(11x3x14)
x=462/22=21
Hence, the required number of days = 21
Answer is B.
Question: The circumferences of two circles are 264 meters and 352 meters. Find the difference between the areas of the larger and the smaller circles?
A.2887 sq m
B.6866 sq m
C.4312 sq m
D.9277 sq m
Answer: C.4312 sq m
Explanation: Let the radii of the smaller and the larger circles be s m and l m respectively.
2∏s = 264 and 2∏l = 352
s = 264/2∏ and l = 352/2∏
Difference between the areas = ∏l2 - ∏s2
= ∏{1762/∏2 - 1322/∏2}
= 1762/∏ - 1322/∏
= (176 - 132)(176 + 132)/∏
= (44)(308)/(22/7) = (2)(308)(7)
= 4312 sq m
Answer: C
Question: A train passes a man standing on the platform. If the train is 170 meters long and its speed is 72 kmph, how much time it took in doing so?
A.3 1/2 sec
B.3 5/2 sec
C.3 7/2 sec
D.8 1/2 sec
Answer: D.8 1/2 sec
Explanation: D = 170
S = 72 * 5/18 = 20 mps
T = 170/20 = 8 1/2 sec
Answer: D
Question: (2^x) (30^3) = (2^3) (3^3) (4^3) (5^3)
In the above equation, what is the value of x?
A.9
B.7
C.8
D.6
Answer: D.6
Explanation: D
6
(2^x)(30^3) = (2^3) (3^3) (4^3) (5^3)
(2^x)(30^3) = (120^3)
(2^x) = (120^3)/ (30^3)
(2^x) = (4^3)
(2^x) = 64
ln(2^x) = ln(64)
x ln(2) = ln(64)
x = ln(64)/ln(2)
x = 6
Thus x = 6.
Question: How much water should be added to 13 liters of a 20%-solution of alcohol to reduce the concentration of alcohol in the solution by 75% ?
A.25 liters
B.27 liters
C.30 liters
D.32 liters
Answer: B.27 liters
Explanation: Let x ltr water to be added
2ltr alcohol to be represented as (20(1-3/4(new soln.=13+x)))
2=5%*(13+x)-------->x=27
Ans B
Question: The equal amounts of money are deposited in two banks each at 15% per annum for 3.5 years and 5 years respectively. If the difference between their interests is Rs.144, find the each sum?
A.299
B.100
C.270
D.278
Answer: B.100
Explanation: (P*5*15)/100 - (P*3.5*15)/100 = 144
75P/100 – 52.5P/100 = 144
22.5P = 144 * 100
=> P = Rs.640.Answer: B
Question: Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?
A.11 1/7
B.11 1/4
C.11 1/3
D.11 1/2
Answer: B.11 1/4
Explanation: 3/12 + x/15 = 1
x= 11 1/4.Answer: B
Question: A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
A.6 min
B.4 min
C.2 min
D.5 min
Answer: A.6 min
Explanation: Clearly, pipe B is faster than pipe A and so, the tank will be emptied.
Part to be emptied = 2/5
Part emptied by (A + B) in 1 minute = (1/6 - 1/10) = 1/15
1/15 : 2/5 :: 1 : x
x = (2/5 * 1 * 15) = 6 min.
So, the tank will be emptied in 6 min.
Answer:A
Question: by what least number 675 be multiplied to obtain a number which is a perfect cube ?
A.5
B.6
C.7
D.8
Answer: A.5
Explanation: Solution
675 = 5 * 5 * 3 * 3 *3 .
to make it a perfect cube, it must be multiplied by 5.
Answer A
Question: A store owner estimates that the average price of type A products will increase by 30% next year and that the price of type B products will increase by 10% next year. This year, the total amount paid for type A products was $4500 and the total price paid for type B products was $8300. According to the store owner's estimate, and assuming the number of products purchased next year remains the same as that of this year, how much will be spent for both products next year?
A.$14,980
B.$15,325
C.$16,000
D.$16,225
Answer: A.$14,980
Explanation: cost of type A products next year = 1.30 * 4500 = 5850
cost of type B products next year = 1.1 * 8300 = 9130
total 5850 + 9130 = 14980 option A
Question: Magnabulk Corp sells boxes holding d magnets each. The boxes are shipped in crates, each holding c boxes. What is the price charged per magnet, in cents, if Magnabulk charges m dollars for each crate?
A.100cd/m
B.cd/(100m)
C.100m/(cd)
D.m/(cd)
Answer: C.100m/(cd)
Explanation: crate has = cd magnates
C crate cost = m dollars = 100 m cents
each magnate cost for each crate = 100 m / cd
Ans; C
Question: A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
A.176 m
B.240 m
C.267 m
D.602 m
Answer: B.240 m
Explanation: Speed = (54 * 5/18) m/sec
= 15 m/sec. Length of the train
= (15 x 20)m = 300 m. Let the length of the platform be x meters. Then, (x + 300)/36 = 15
==> x + 300 = 540 ==> x
= 240 m
Answer: B
Question: A, Band C start a business each investing Rs. 20,000. After 5 months A withdrew Rs.6000 B withdrew Rs. 4000 and C invests Rs. 6000 more. At the end of the year, a total profit of Rs. 69,900 was recorded. Find the share of each.
A.19500;22500;24500
B.18400;21900;23100
C.20500;21200;28200
D.22300;19850;20600
Answer: C.20500;21200;28200
Explanation: Ratio of the capitals of A, Band C
= 20000 x 5 + 15000 x 7 : 20000 x 5 + 16000 x 7 : 20000 x 5 + 26000 x 7
= 205000:212000 : 282000 = 205 : 212 : 282.
A’s share = Rs. 69900 x (205/699) = Rs. 20500	I
B's share = Rs. 69900 x (212/699) = Rs. 21200;
C's share = Rs. 69900 x (282/699) = Rs. 28200.
Answer is C.
Question: A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 450 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?
A.370
B.365
C.360
D.380
Answer: C.360
Explanation: C
450 * T = 1 km => T = 1/450 km/h
V*(T+2/3600) = 1
V (1/450 + 2/3600) = 1 => V = 360 km/h
Question: Torry has submitted 2/5 of his homework assignments, and he received an average grade of 75 for those assignments. If he wishes to receive an average grade of 84 for all his homework assignments, the average grade for Torry's remaining homework assignments must be what percent greater than the average grade for the assignments he has already submitted?
A.15%
B.20%
C.25%
D.33 1/3%
Answer: B.20%
Explanation: 0.4*75 + 0.6x = 84
30 + 0.6x=84
0.6x = 54
x= 90
90/75= 1.2
Ans:B
Question: Excluding stoppages, the average speed of a bus is 60 km/hr and including stoppages, the average speed of the bus is 30 km/hr. For how many minutes does the bus stop per hour?
A.22
B.30
C.77
D.20
Answer: B.30
Explanation: In 1hr, the bus covers 60 km without stoppages and 30 km with stoppages.
Stoppage time = time take to travel (60 - 30) km i.e 30 km at 60 km/hr.
stoppage time = 30/60 hrs = 30 min.
Answer: B
Question: In a stack of boards at a lumber yard, the 41th board counting from the top of the stack is immediately below the 23th board counting from the bottom of the stack. how many boards are in the stack?
A.68
B.62
C.65
D.64
Answer: B.62
Explanation: 1 2 3 ... 14 15 16 ...................
..............41 40 ................. 1
So the number of boards = 41+21 =62
Option: B
Question: A, B and C can do a work in 6, 8 and 12 days respectively doing the work together and get a payment of Rs.1800. What is B’s share?
A.600
B.278
C.298
D.267
Answer: A.600
Explanation: WC = 1/6:1/8:1/12 => 4:3:2
3/9 * 1800 = 600
Answer:A
Question: What decimal of an hour is a second ?
A.0.0027
B.0.00027
C.0.027
D.0.00072
Answer: B.0.00027
Explanation: Required decimal = 1/60x60 = 1/3600 = .00027
Answer is B.
Question: The food in a camp lasts for 40 men for 45 days. If fifteen more men join, how many days will the food last?
A.80 days
B.33 days
C.35 days
D.16 days
Answer: B.33 days
Explanation: one man can consume the same food in 40*45 = 1800 days.
15 more men join, the total number of men = 55
The number of days the food will last = 1800/55
= 33 days.
Answer:B
Question: A sum of Rs 1162.00 is divided among A, B and C such that 4 times A’s share is equal to 5 times B’s share and 7 times C’s share. What is the share of C?
A.280
B.285
C.270
D.295
Answer: A.280
Explanation: given 4x=5y=7z
so x:y=5:4
y:z=7:5
x:y:z=35:28:20
c share=20*1162/(35+28+20) =280.
ANSWER:A
Question: A customer using a certain telephone calling plan pays a fee of $25 per month, and then receives a discount of 40% on the regular charge for all calls made to country A. If calls to country A are regularly charged at $1.60 per minute for the first 3 minutes, and $0.80 per minute for each minute thereafter, what is the maximum the customer could have saved over regular prices if he was charged for 1 hour of calls made to country A in a certain month?
A.$8.75
B.$12
C.$13.40
D.$17.40
Answer: C.$13.40
Explanation: Discount = 40% of spending
We want to maximise discount so we will need to maximise spending. We do that by assuming that 60 calls were made of 1 min each because the first minute is the most expensive.
Max discount = (40/100)* 60 * 1.6 = (40/100)*96
This would be slightly less than 40. About 38 to 39.
Saving = (Slightly less than 40) - 25 = Slightly less than 15
Answer (C)
Question: At what angle the hands of a clock are inclined at 15 minutes past 5 ?
A.72 1⁄2°
B.64°
C.58 1⁄2°
D.67 1⁄2°
Answer: D.67 1⁄2°
Explanation: At 15 minutes past 5, the minute hand is at 3 and hour hand slightly advanced from 5. Angle between their 3rd and 5th position.
Angle through which hour hand shifts in 15 minutes is
(15 &times 1⁄2)° = 7 1⁄2°
∴ Required angle = (60 + 71⁄2) = 67 1⁄2°
Answer D
Question: For the bake sale, 5 people brought cookies, 2 people brought pies, 6 brought brownies, and 5 people brought cakes. If each person only brought one item, how many people brought items in all?
A.14
B.18
C.22
D.23
Answer: B.18
Explanation: As each person only brought one item, you can simply add the number of items brought: 5+2+6+5=18. As such, the correct answer is B: 18.
Question: In a race of length L metres, Johnson beats Lewis by U metres and Greene by V metres, By how many metres does Lewis beat Greene in the same race ? (U<V)
A.L(L-V) / L-U
B.L(V-U) / L-U
C.L-V
D.U-V
Answer: B.L(V-U) / L-U
Explanation: As the time is constant, the ratio of distances will be the same as the ratio of speeds.
If Sj,Sl,Sg are the speeds of Johnson, Lewis, and Greene respectively, then
Sj/Sl = L/(L-U)
and Sj/Sg = L/(L-V)
=> Sg/Sl = (L-V)/(L-U)
Therefore the speeds of Lewis and Greene are in the ratio (L-U)/(L-V)
When Lewis finishes the race, the time run by him and Greene are same
=> The ratio of the speeds of Lewis and Greene will be the same as the ratio of distances run by them.
=> Distance run by Greene when Lewis finishes the race = (L-V)/(L-U) * L
=> Lewis beats Greene by L - L*(L-V)/(L-U) = L [ 1 - (L-V)/(L-U)] = L (V-U) / (L-U)
Option (B) is therefore correct.
Question: There are 24 girls in hostel whose average age is decreased by 2 months, when one girl 18 yrs is replaced by a new boy.Find the age of new girl.
A.1 year
B.1 years 2 months
C.2 years 5 months
D.4 years
Answer: D.4 years
Explanation: Total decrease = 24 * 2 = 48 months
= 4 years
D
Question: A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?
A.9
B.7
C.6
D.1
Answer: B.7
Explanation: Explanation:
Clearly, we have (3 + 11 + 7 + 9 + 15 + 13 + 8 + 19 + 17 + 21 + 14 + x) / 12 = 12.
or 137 + x = 144 or x = 144 - 137 = 7.
Answer: B
Question: If x dollars is invested at 10 percent for one year and y dollars is invested at 8 percent for one year, the annual income from the 10 percent investment will exceed the annual income from the 8 percent investment by $56. If $2,000 is the total amount invested, how much is invested at 8 percent?
A.$280
B.$800
C.$892
D.$1,108
Answer: B.$800
Explanation: (A) $280 (B) $800 (C) $892 (D) $1,108 (E) $1,200
y = 2000 - x
.1x - .08(2000-x) = 56
.-160+.18x = 56
x = 1200 and y = 800
ANSWER:B
Question: In a certain book club, the members are voting between two books – a comic novel and a biography – to decide which book the group will read next. There are 3 times as many votes for the comic novel as there are votes for the biography. The ratio of biography votes to the comic votes is
A.1 to 2
B.1 to 3
C.1 to 4
D.2 to 3
Answer: B.1 to 3
Explanation: IMO : Answer B 1 to 3