PEA305

1. The average of the first five prime numbers is:

A] 4.5 B] 5 C] 5.6 D] 7.5

2. The average of the first five multiples of 3 is:

A] 3 B] 9 C] 12 D] 15

3. The average of three numbers is 20. If the two numbers are 16 and 22, the third number is:

A] 22 B] 20 C] 19 D] 18

4. The average of five results is 46, and that of the first four is 45. The fifth result is:

A] 1 B] 10 C] 12.5 D] 50

5. The average of Radhika’s marks in 7 subjects is 75. Her average in six subjects excluding Science is 72. How many marks did she get in Science?

A] 72 B] 90 C] 93 D] None of these

6. Of three numbers, the second is twice the first and is also thrice the third. If the average of the three numbers is 44, the largest number is:

A] 24 B] 36 C] 72 D] 108

7. The average of ten numbers is 7. If each number is multiplied by 12, then the average of the new set of numbers is:

A] 7 B] 19 C] 82 D] 84

8. The average age of 30 students of a class is 12 years. The average age of a group of 5 of the students is 10 years, and that of another group of 5 of them is 14 years. What is the average age of the remaining students?

A] 8 years B] 10 years C] 12 years D] 14 years

9. The average of 50 numbers is 38. If two numbers, 45 and 55, are discarded, the average of the remaining numbers is:

A] 36.5 B] 37 C] 37.5 D] 37.52

10. The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

A] 39 B] 39.7 C] 40.3 D] 42.7

11. The average of 11 observations is 60. If the average of the first five observations is 58 and that of the last five is 56, the sixth observation is:

A] 90 B] 110 C] 85 D] 100

12. Harish has twice as much money as Rohan, and Rohan has 50% more money than what Anita has. If the average money with them is Rs. 110, then Harish has:

A] Rs. 55 B] Rs. 60 C] Rs. 90 D] Rs. 180

13. A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is:

A] 35 B] 37 C] 37.5 D] 40

14. The average of 5 numbers is 7. When 3 new numbers are added, the average of the eight numbers is 8.5. The average of the three new numbers is:

A] 11 B] 7.75 C] 8.5 D] 7

15. The average age of 24 boys and the teacher is 15 years. When the teacher’s age is excluded, the average decreases by 1. What is the age of the teacher?

A] 38 years B] 39 years C] 40 years D] Data inadequate

16. The average salary per month of 30 employees in a company is Rs. 4000. If the manager’s salary is added, the average salary increases to Rs. 4300. What is the salary of the manager?

A] Rs. 10000 B] Rs. 13000 C] Rs. 12000 D] Rs. 13300

17. The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 years. The average age of the new students is:

A] 15.2 years B] 16 years C] 16.2 years D] 16.4 years

18. The average weight of 8 men is increased by 1.5 kg when one of the men who weighs 65 kg is replaced by a new man. The weight of the new man is:

A] 76 kg B] 76.5 kg C] 76.7 kg D] 77 kg

19. The average weight of 6 men decreases by 3 kg when one of them weighing 80 kg is replaced by a new man. The weight of the new man is:

A] 56 kg B] 58 kg C] 62 kg D] 76 kg

20. The average age of a committee of eight members is 40 years. A member aged 55 years retired, and his place was taken by another member aged 39 years. The average age of the present committee is:

A] 39 years B] 38 years C] 36 years D] 35 years

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