Girls vs Boys Menti#!#Geography

In a group of boys and girls , 15 girls left the group , the ratio boys and girls becomes 2:1 . If after , 45 boys left the group , the ratio become 1 :5 Initially ,how many girls were there in the group ?

Six boys and six girls sit in a row randomly. Find the probability that (i) the six girls sit together,(ii) the boys and girls sit alternately.

5 boys and 5 girls are sitting in a row randomly . The probability that boys and girls sits alternatively , is

In class VI,there are 30 students.If the number of girls is 3 more than twice the number of boys,then the number of boys and girls are:

In a class of 60 students, the number of girls is one third the number of boys. Find the number of girls and boys in the class.

A committee of 4 boys and 3 girls is chosen from 8 boys and 5 girls. One of the boys is a brother of one of the girls. Probability that both are in the committee is