Question

ankita organised a picnic and invited 1/5 of her classmates if 1/3 classmates invited were boys

find how many girls were invited by ankita if there were 60 students in her class

Answer 1

she invited 1/5 classmates . The total number of students is 60. 

1/5*60=60/5=12 people invited

boys : 1/3*12=12/3=4 boys
girls: 12-4=8 girls

Answer 2

ankita invited1/5 of her classmate in a party:-
 
i.e total classmates are:-$\frac{1}{5} * 60$   [bcos total students in class are 60]
i.e total class mates are:12.

1/3 invited classmates are boys=>  12*$\frac{1}{3}$ = 4 boys.

if there are 12 students then girls are:12-4=8

hence there are total 8 girls are invited in the party.

hope dis is helpfull 4 u....