# SBI Clerks Numerical Ability Important Questions with Key

1. The average age of 4 students is 12 years.
The ages of three of them are 9 years, 13 years and 11 years, find the age of the fourth student.
1) 12.5 yrs 2) 15 yrs 3) 12 yrs
4) 13 yrs 5) None of these

2. The average age of 30 boys of a class is 12 years and 20 girls is 11 years. What is the average age of all the students?
1) 11.5 yrs 2) 13 yrs 3) 12.4 yrs
4) 11.6 yrs 5) None of these

3. The average of nine numbers is 16. The average of first four numbers is 13 and the average of last four numbers is 18. What is
the middle number?
1) 22 2) 17 3) 20 4) Can't be determined 5) None of these

4. The average of seven numbers is 21. The average of first four numbers is 17 and the last four numbers is 22. Find the fourth
number.
1) 19 2) 19.5 3) 15 4) Can't be determined 5) None of these

5. A car travels 330 kms in 6 hours and another 150kms in 2 hours. What is the average speed of the car for the entire distance?
1) 45 kmph 2) 60 kmph 3) 50 kmph
4) 40 kmph 5) None of these

6. What is the average of first five prime numbers greater than 20?
1) 32 2) 37 3) 29.6 4) 32.2 5) None of these

7. The average age of a class of 28 students is 14 years. If the teacher's age is also included, the average increases by one year.
Find the age of the teacher.
1) 43 2) 46 3) 42 4) 39 5) None of these

8. The average of 20 numbers is 15 and it was later found that one of the numbers was misread as 46 instead of 26. What is the
correct average?
1) 14 2) 16 3) 17 4) 15.5 5) None of these

9. The average marks of a student in Maths and English is 75. His average of marks in Maths and Science is 65. What is the difference between the marks which he obtained in English and Science?
1) 20 2) 10 3) 30 4) 25 5) None of these

10. The average weight of 8 persons increases by 1.5kg when a person weighting 65kg is replaced by a new person. What could be the weight of the new person?
1) 55 kg 2) 77 kg 3) 72 kg 4) 65 kg 5) None of these

11. Present ages of Harini and Tarini are in the ratio 5:6 respectively. After seven years this ratio becomes 6:7 respectively. What is present age of Harini?
1) 25 2) 20 3) 30 4) 35 5) None of these

12. A batsman has a certain average of runs for 16 innings.
In the 17th innings, he makes 85 runs, thereby increasing his average by 3. What is the average after 17th innings?
1) 34 2) 31 3) 37 4) 39 5) None of these

13. The marks obtained by a student in Mathematics, Science and English are respectively 128 out of 150, 60 out of 75 and 82 out of 100. Find his approximate average score in percent.
1) 75 2) 77 3) 83 4) 91 5) None of these

14. There were 36 students in a hostel. If the number of students
increased by 4, the expenses of the mess were increased by Rs.32 per day while the average expenditure per head diminished by Rs.1. What is the original expenditure of the mess?
1) Rs.628 2) Rs.596 3) Rs.618 4) Rs.648 5) None of these

15. Ramesh spends Rs.1400 per month on an average for the first five months, Rs.1250 for next seven months and saves Rs.3450 a year. What is his average monthly income?
1) Rs.1750 2) Rs.1600 3) Rs.1950
4) Rs.1575 5) None of these

16. The average monthly salary of 660 total employees in a factory is 3800. The average monthly salary of officers is Rs.21000 and the average monthly salary of the workers is Rs.3400. Find the number
of workers.
1) 645 2) 620 3) 585 4) 615 5) None of these

17. The average age of 12 men is decreased by one year when two of them of ages 28 years and 32 years are replaced by two new persons of same age. What is the age of the new person?
1) 48 2) 28 3) 24 4) 32 5) None of these

18. Average of five numbers is 19. If 7 is added to each of these numbers, what will be the average of the new numbers?
1) 21 2) 23.5 3) 23 4) 26 5) None of these

19. The average temperature for Tuesday, Wednesday and Thursday is 34.6°C. The average temperature for Wednesday, Thursday and Friday is 34.9°C. If Tuesday's temperature recorded as 36°C ,find Thursday's temperature.
1) 40.4°C 2) 39.2°C 3) 40.2°C 4) 41.4°C 5) None of these

20. A car travels a certain distance. The speed of the car for the first half is 60 kmph and for the remaining distance it is 90 kmph. What is the average speed of the car for the entire distance?
1) 75 kmph 2) 72 kmph
3)74 kmph 4) Can't be determined
5) None of these

KEY : 1) 2 2) 4 3) 3 4) 5 5) 2 6) 4 7) 1 8) 1 9) 1 10) 2 11) 4 12) 3 13) 3 14) 4 15) 2 16) 1 17) 3 18) 4 19) 5 20) 2.