The average age of a husband and wife was 23 years when they were married 5 years ago. The average age of the husband, wife and a child who was born during the interval is 20 years now. How old is the child now?

The average age of students of class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of number of boys to the number of girls in the class is

Answer:

A) 2.8

B) 2.6

C) 2.3

D) 2.5

Explanation:

Suppose the number of boys and girls are x and y respectively

After four years, the age of father will be thrice the age of his son. Where as four years ago, he was eight times as old as his son was. What is the father’s present age?

Answer:

A)

B)

C)

D)

Explanation:

Let, son’s age be ‘x’ years, after 4 years father’s age will be ‘3x’ years

The average age of a couple was 26 years at the time of marriage. after 11 years of marriage, the average age of the family with 3 children become 19 years. The average age of the children is

Answer:

A) 7 years

B) 5 years

C) 2 years

D) 4 years

Explanation:

The average age of a couple = 26 years

Total age of couples = 26×2 = 52 years

Total age of couple after 11 years

= 52+2×11 = 74 years

Suppose average age of 3 children after 11 years is 3x years