Quantitative Aptitude Questions for IBPS/RRB Exam Set – 21

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(1-3): A basket contains 8 white, 4 red and 6 blue color balls.

1. If 3 balls are drawn at random, then what is the probability that all are white?
   A. 7/102
   B. 1/6
   C. 3/8
   D. 7/204
   
   Answer

   A. 7/102
   
   
2. If 3 balls are random, then what is the probability that 2 are blue and 1 is red?
   A. 5/34
   B. 17/408
   C. 19/816
   D. 5/68
   
   Answer

   D. 5/68
   
   
3. If 3 balls are drawn at random, then what is the probability that 1 of each color is drawn?
   A. 1/3
   B. 13/24
   C. 3/136
   D. 4/17
   
   Answer

   D. 4/17
   
   
4. The amount of money becomes Rs 4840 in 2 years and Rs 5324 in 3 years on CI. Find the rate percentage per annum.
   A. 10%
   B. 5%
   C. 20%
   D. 15%
   
   Answer

   C. 20%
   
   
5. While selling a watch, a shopkeeper gives a discount of 5%. If he gives a discount of 6%, he earns Rs 15 less as profit. What is the marked price of the watch?
   A. Rs 1250
   B. Rs 1500
   C. Rs 1400
   D. Rs 1000
   
   Answer

   B. Rs 1500
   
   
6. In a solution of 70 litres, spirit and alcohol are in the ratio of 5 : 2. How much alcohol should be added to make the ratio of spirit and alcohol equal?
   A. 26 litres
   B. 24 litres
   C. 22 litres
   D. 30 litres
   
   Answer

   D. 30 litres
   
   
7. A trader bought two horses for Rs 19,500. He sold one at a loss of 20% and the other at a profit of 15%. If the selling price of each horse is the same, then their cost prices are respectively?
   A. 10,000 and 9,500
   B. 11,500 and 8,000
   C. 12,000 and 7,500
   D. 10,500 and 9,000
   
   Answer

   B. 11,500 and 8,000
   
   
8. 97, 83, 73, 67, 59, ?
   A. 47
   B. 53
   C. 49
   D. None of these
   
   Answer

   A. 47
   Explanation:
   Prime numbers
   
   
9. 12, 14, 15, 16, 18, 20, ?
   A. 23
   B. 22
   C. 21
   D. 25
   
   Answer

   C. 21
   Explanation:
   Composite numbers
   
   
10. A boat takes 90 minutes less to travel 36 miles downstream that to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:
    A. 2 mph
    B. 3 mph
    C. 4 mph
    D. 2.5 mph
    
    Answer

    B. 3 mph