IBPS PO Prelims 2017 - Quantitative Aptitude
| 1. | Sum of the present ages of A, B, C and D is 76 years. After 7 years ratio of their ages is 7 : 6 : 5 : 8. What is C’s present age? |
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A. 14
B. 12
C. 13
D. 8
E. 10
View Answer Discuss Work SpaceAnswer: option c
Explanation:
At present sum of age = 76
After 7 years sum of age will be 7x + 6x+ 5x+ 8x = 76 + 7 × 4
26x = 76 + 28
x = 4
C’s present age = 5x – 7 = 20 – 7 = 13
| 2. | Sum of the length of two trains A and B is 660. The ratio of the speeds of A and B is 5 : 8. Ratio between time to cross an electric pole by A and B is 4 : 3. Find the difference in the length of two trains. |
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A. 50
B. 60
C. 80
D. 75
E. 90
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Sum of length of train = 660
l1 + l2 = 660
SA : SB = 5 : 8
Let speed be 5x and 8x
And time taken to cross pole be 4y, 3y
So, 5x × 4y + 8x + 3y = 660
44xy = 660
xy = 15
l1 – l2 = 24xy – 20xy = 4xy = 60
| 3. | A mixture of milk and water in a jar contains 28 L milk and 8 L water. X L milk and X L water are mixed to form a mixture. If 40% of the new mixture is 20 L, then find the value of X. |
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A. 7 L
B. 8 L
C. 6 L
D. 5 L
E. 9 L
View Answer Discuss Work SpaceAnswer: option a
Explanation:
40% of new mixture = 20L
100% of new mixture = 20/40 x 100 = 50 L
28 + x + 8 + x = 50
2x = 50 – 36 x = 7L
| 4. | A alone can do a work in 24 days. Time taken by A in completing 1/3 of work is equal to the time taken by B in completing 1/2 of the work. In what time A and B together will complete the work? |
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A. 9 days
B. 10 days
C. 12 days
D. 48/5 days
E. 8 days
View Answer Discuss Work SpaceAnswer: option d
Explanation:
Time taken by A in completing 1/3 of work 24 x 1/3 = 8 days
8 days = time taken by B in completing 1/2 of work
B alone will complete the work = 16 days
Required time = 16 x 24 / 40 = 48/5 days
| 5. | Marked price of A is Rs. 1600 more than its cost price. When discount on A is 500 a profit of 25% is obtained. At what price should A be sold to obtain a 30% profit. |
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A. 4800
B. 5600
C. 5400
D. 5200
E. None of these
View Answer Discuss Work SpaceAnswer: option e
Explanation: