ARITHMETIC ABILITY

1. If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

    A. 60

    B. 45

2. In what time will a train 100 meters long cross an electric pole, if its speed is 144 km/hr?
     A. 5 seconds
     B. 2.5 seconds

3. What will be the 40% of a number whose 200 per cent is 90?
    A. 18
    B. 45
    C. 16

4. If 10 people can do a job in 20 days, then 20 people with twice the efficiency can do the same job in
     A. 5 days
    B. 10 days

5. The average age of Ram and his two children is 17 years and the average age of Ram's wife and the same children is 16 years. If the age of Ram is 33 years, the age of his wife is (in years)
    A. 31
    D. 30

6. How long does the Earth take to turn 1° Longitude during its rotation?
     Ans: 4 minutes

7. The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:
      A. 161
      B. 162

8. Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.
     A. 4
     B. 7

9. Find the largest number of four digits such that on dividing by 15, 18, 21 and 24 the remainders are 11, 14, 17 and 20 respectively.
    A. 6557
    B. 7556

10. If the product of three consecutive numbers is 210, then the sum of the smaller numbers is: 
       A. 3
       B. 4
       C. 5
       D. 11

11. A man borrows Rs. 21000 at 10% compound interest. How much he has to pay equally at the end of each year, to settle his loan in two years ?
     A. Rs. 12000
     B. Rs. 12100

12. The ratio of ages of a father and son is 17:7 respectively. 6 years ago the ratio of their ages was 3:1 respectively. What is the father's present age?
    A. 64
    B. 51