The average age of a group of 8 members is the same as it was 3 yr ago, when a young member is substituted for an old member. The incoming member is younger to the outgoing member by a) 11 yr b) 16 yr c) 20 yr d) 24 yr ...
In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is two-third of the number of students of 8 years of age which is 48. What is the total number of students in the scho ...
