Quantitative Aptitude Questions for IBPS/RRB Exam Set – 13

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1. A library has an average number of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
   A. 250
   B. 280
   C. 285
   D. None of these
   
   Answer

   C. 285
   Explanation:
   x/5 = 510 and y/25 = 240.
   x + y = 8550
   Average = 8550/30
   
   
2. The number of employees in companies A, B, and C are in the ratio 4 : 5 : 6 respectively. If the number of employees in the company is increased by 25%, 30%, and 50% respectively, what will be the new ratio of the employees working in companies A, B, and C respectively?
   A. 10 : 13 : 18
   B. 13 : 10 : 18
   C. 13 : 15 : 18
   D. None of these
   
   Answer

   A. 10 : 13 : 18
   Explanation:
   Increased ratio:
   125% of 4 : 130% of 5 : 150% of 6
   Or 125*4 : 130*5 : 150*6
   
   
3. Twelve percent of Kaushal’s monthly salary is equal to sixteen percent of Nandini’s monthly salary. Prakhar’s monthly salary is half that of Nandini’s monthly salary. If Prakhar’s annual salary is Rs. 1.08 lacs. What is Kaushal’s monthly salary?
   A. 22000
   B. 18000
   C. 24000
   D. None of these
   
   Answer

   C. 24000
   Explanation:
   Prakhar’s monthly salary = 1,08,000/12 = 9,000
   Nandini’s monthly salary = 2*9,000 = 18,000
   Now 12% of Kaushal’s = 16% of Nandini’s
   
   
   
4. Preeti purchased 20 dozen notebooks at Rs 48 per dozen. He sold 8 dozen at 10% profit and the remaining 12 dozen at 20% profit. What is his profit % in the transaction?
   A. 15%
   B. 16%
   C. 18%
   D. None of these
   
   Answer

   B. 16%
   Explanation:
   8/20 * (10) + 12/20 * (20) = 4 + 12 = 16%
   
   
5. If the compound interest for two successive years is Rs 1100 and Rs 1210 respectively, then what is the rate percent?
   A. 11%
   B. 10%
   C. 12.1%
   D. None of these
   
   Answer

   B. 10%
   Explanation:
   R% of 1100 = 1210 – 1100
   R/100 * 1100 = 110
   R = 10%
   
   
6. Excluding the stoppages the speed of the bus is 64 kmph and including the stoppages the speed of the bus is 48 kmph. For how many minutes does the bus stop per hour?
   A. 12.5 min
   B. 18 min
   C. 15 min
   D. None of these
   
   Answer

   C. 15 min
   Explanation:
   (48 – 64)/64 *60
   =16/64 * 60 = 15
   
   
7. A does half as much as B and C does half as much as A and B together. If C alone can finish the work in 40 days, then together all will finish the work in?
   A. 13 1/3 days
   B. 15 days
   C. 20 days
   D. None of these
   
   Answer

   A. 13 1/3 days
   Explanation:
   C does half as much as A and B together. This means that if (A + B) takes x days together to do a work, then C takes 2x days to complete same work.
   now given that C takes 40 days. So 2x = 40. So x = 20
   Now (A + B) takes 20 days, C takes 40 days, then A+B+C takes 1/20 + 1/40
   
   
8. Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?
   A. 25200
   B. 1050
   C. 210
   D. None of these
   
   Answer

   A. 25200
   Explanation:
   7C3 * 4C2 * 5!
   
   
9. In how many ways a committee consisting of 5 men and 6 women can be formed from 8 men and 10 women?
   A. 5040
   B. 11760
   C. 11780
   D. None of these
   
   Answer

   B. 11760
   Explanation:
   8C5 * 10C6
   
   
10. Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?
    A. 3/8
    B. 3/4
    C. 5/16
    D. None of these
    
    Answer

    B. 3/4
    Explanation:
    1,2 1,4 1,6
    2,1 2,2 2,3 2,4 2,5 2,6
    3,2 3,4 3,6
    4,1 4,2 4,3 4,4 4,5 4,6
    5,2 5,4 5,6
    6,1 6,2 6,3 6,4 6,5 6,6