In the sub-district Math fair, `60 %` of the children were girls. The actual number of girls was 8108. How many children were there in all?

In a school, there were 800 children last year, and this year, the number is 12 % more. How many children are there now?

There are 320 children in the subdistrict camp for scouts and guides. 55 % of them were guides and the rest, scouts. How many scouts were there?

In a class, 20 % of the children are members of the Math Club. There are 35 children in the class. How many are members of the Math Club?

In a compound, there are 32 coconut trees and they form 50 % of the total number of trees. How many trees are there in all?

In a school there, are 1240 children and 30 % of them are girls. How many boys are there in the school?

There are 40 children in a class and 50 % of them are boys. How many boys are there in this class?

A class has 4 more girls than boys. One day when only 8 boys were absent, the number of girls were twice that of boys. How many girls and boys are there in the class?

26 children of a class got A grade in an exam. It is 65 % of the total number in the class. How many are there in the class?

upon irradiation californium with neutron, a radio chemist discovered a new nuclide having mass number of 250 and a half life of 30 minutes. Three hours after the irradiation, the observed radioactivity due to the nuclide was 10 dis/minute. How many atoms of the nuclide were prepared initially ?