In a class there are 30 boys and their average age is 17 years. On one boy aged 18 years leaving the class and another joining, the average age becomes 16.9 years. The age of new boy is

In a class there are 30 boys and their average age is 17 years. On one

1.	In a class there are 30 boys and their average age is 17 years. On one boy aged 18 years leaving the class and another joining, the average age becomes 16.9 years. The age of new boy is
A.	25 years
B.	11 years
C.	13 years
D.	15 years
Answer» E.

Discussion

No Comment Found

Related MCQs

An army of 12000 consists of Europeans and Indians. The average height of a European is 5ft 10 inches and that of an Indian is 5ft 9 inches and that of the whole army is 5ft 93inches. 4Then the number of Indians in the army is
The average age of two boys and their father is greater then average age of those two boys and their mother by 3 yr. The average age of the four is 19 yr. If the average age of the two boys be 51/2, then find the age of the father and mother.
Average weight of three boys P, T and R is 541/3 kg, while the average weight of three boys T, F and G is 53 kg. What is the average weight of P, T, R, F and G ?
The average of x1, x2 and x3 is 14. Twice the sum of x2 and x3 is 30. What is the value of x1 ?
If the average of m numbers is n2 and that of n numbers is m2,then average of (m + n) numbers is
The average age of 54 girls in a class was calculated as 14 yr. It was later relized that the actual age of one of the girls in the class was 10.5 yr but it was calculated as 13 yr. What is the actual averge age (round off) of the the girls in the class ? (Find the approximate answer.)
The average of 5 consedutive old posstive integers is 9. The least one amonge themis
The mean temperature of Monday to Wednesday was 37 C and of Tuesday to Thursday was 34 C . If in the temperature on Thursday was 4/5th that of Monday, what was temperature on Thursday ?
The average of eight numbers is 20. If the sum of first two numbers is 31, the average of the next three numbers is 211and the seventh and eighth numbers exceed the sixth number by 4 and 7 respectively, then the eighth number is3
The average weight of the 8 oarsmen in boat is increased by 11 /2 kg when one of the crew who weighs 60 kg is replaced by a new man. The weight of the new man (in kg) is

In a class there are 30 boys and their average age is 17 years. On one boy aged 18 years leaving the class and another joining, the average age becomes 16.9 years. The age of new boy is

Discussion

No Comment Found

Related MCQs

Reply to Comment