there are 82 people collecting signatures to protest the des

there are 82 people collecting signatures to protest the destruction of rain forests. If there are 47 males and 28 teenageser, 13 of whom are girls, than how many females are collecting signatures

Solution

Number of boy (male) teenageser is 28-13=15

So total numberof males : 47+15=62

Therefore number of females collecting sigatures is : 82-62=20

Hence, 20 females are collecting signatures.