Question

A class has 20 boys and 20 girls. The average age of girls in a class is 16 years and average age of boys in the

class in 17 years. One girl and one boy leave the class and the average age of the girls reduced by 1 year and that of

boys reduced by 2 ​

Answer 1

Total decrease

= ( 20 X 2 ) months

= 3 years 4 month

∴ Age of the new boy

= ( 18 years ) – ( 3 years 4 months)

= 14 years 8 month