# QUIZ 3 MATHS

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

1) 38                      2) 40                      3) 39                      4) 37                      5) None of these

1. Three years ago, the average age of A,B and C was 27 years and that of B and C 5 years ago was 20 years A’s present age is

1) 30 Years          2) 35 Years          3) 40 Years          4) 48 Years          5) None of these

1. Ajit Tendulkar has a certain average for 9 innings. In the tenth inning, he scores 100 runs thereby increasing his average by 8 runs. His new average is

1) 20                      2) 24                      3) 28                      4) 32                      5) None of these

1. The average age of a family of 6 members is 22 years. If the age of the youngest

member be 7 years, what was the average age of the family at the birth of the

youngest member?

1) 15                      2) 18                      3) 21                      4) 12                      5) None of these

1. The average age of 8 persons in a committee is increased by 2 years when two men aged 35 years and 45 years are substituted by two women. Find the average age of the two women.

1) 48                      2) 45                      3) 51                      4) 42                      5) None of these

1. The average weight of a class of 29 students is 40 kg. if the weight of the teacher be included, the average rises by 500 gm. What is the weight of the teacher?

1) 40.5 kg            2) 50.5 kg            3) 45 kg                4) 55 kg                5) None of these

1. The age of Shaurya and Kauravki is in the ratio 2:6. After 5 years, the ratio of their ages will become 6:8. Find the average of their ages after 10 years.

8.If we take four numbers, the average of the first three is 16 and that of the last

three is 15. If the last number is 18, the first number is

1) 20                      2) 21                      3) 23                      4) 25                      5) None of these

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

average of the new set of number is

1) 7                        2) 19                      3) 82                      4) 84                      5) None of these

1. The average weight of 5 men is decreased by 3 kg when one of them weighing 150 kg is replaced by another person. Find the weight of the new person.

1) 165 kg              2) 135 kg              3) 138 kg              4) 162 kg              5) None of these