Question

the ratio of number of girls to the number of boys in a class is 7:5 .if the number of boys are 15 in the class, then the number of girls in the class is =14,21,28 or
36

Answer 1

7×15/5
=21girls.........

Answer 2

check the relation between ratio of boys and no of boys. u could see 5 as ratio as 15 as total no of boys we know 5×3=15.so multiply the same for 7. 7×3=21

therefore the answer might be 21

hope u understand (^_^)