## Average Aptitude Test Paper 26) Average age of a group of 30 boys is 16 years. A boy of age 19 leaves the group and a new boy joins the group. If the new average age of the group is 15.8 years, find the age of the new boy. - 12 years
- 13 years
- 14 years
- 15 years
The correct answer is
Let the age of new boy = X years Total age of 30 boys = 30*16 = 480 years As per question, if we minus age of boy who leaves the group and then add the age of boy who joins the group the new average becomes = 15.8 years. ∴ = 15.8 480 - 19 + X = 474 X = 474 - 480 +19 X = - 6 +19 = 13 years 7) The average weight of 10 men is decreased by 2 kg when one of them whose weight is 60 kg is replaced by a new man. What is the weight of the new man? - 35 kg
- 40 kg
- 45 kg
- 50 kg
The correct answer is
Average decrease in weight per person = 2kg There are 10 men so total decrease in weight on replacing a man with a new man = 10 ∗ 2= 20 kg Weight of the man who is replaced = 60 kg ∴The weight of the new man would be = Weight of man replaced - total decrease in weight of the group of 10 men. = 60 - 20 = 40 kg 8) The average age of 30 boys in a class is 15 years. If we include the age of two teachers the average age increases by 1. Find the sum of ages of the two teachers. - 55 years
- 58 years
- 62 years
- 64 years
The correct answer is
Total age of 30 boys would be = 30∗15 = 450 years Total age of 30 boys and 2 teachers would be = 32∗16= 512 years ∴ Sum of ages of two teachers would be = 512 - 450 = 62 years 9) The average age of the committee of 10 members is 40 years. A member of age 52 retires and a new member of age 38 takes his place. What is the average age of the present committee? - 38.6 years
- 33.5 years
- 35.5 years
- 37.5 years
The correct answer is
Total age of the committee = 10 ∗ 40 = 400 years Age of retired member = 52 years Age of new member = 38 years As per question, we will minus 52 years and add 38 years in the total age then divide by 10 to find the new average age of the committee. ∴ = = = = 38.6 years 10) Four years ago, the average age of A and B was 20 years. If today average age of A, B and C is 25 years, what will be age of C after 7 years? - 32 years
- 34 years
- 36 years
- 38 years
The correct answer is
Total age of A and B four years ago = 20 ∗ 2 = 40 years Present total age of A and B would be = 40 + 4∗2 = 48 years Present total age of A, B and C is = 25 ∗ 3 = 75 years ∴ Present age of C would be = 75 - 48 = 27 years Age of C after 7 years = 27 + 7 = 34 years Average Aptitude Test Paper 1 Average Aptitude Test Paper 3 Average Aptitude Test Paper 4 Average Aptitude Test Paper 5 Average Aptitude Test Paper 6 Average Aptitude Test Paper 7 Average Aptitude Test Paper 8 Next TopicAverage Aptitude Test Paper 3 |