Question

In a class the ratio of boys to the girls 7:8.what part of whole class are girls?

Answer 1

total number of boys and girls in the ratio = 8+7=15
ratio of girls = 8
number of girls = 8/15.
∴(8/15) th part of whole class are girls  

Answer 2

Given that the ratio of boys to the girls = 7:8.

The number of boys = 7.

The Number of girls = 8.

The part of girls in the class = 8/(7 + 8)

                                                = 8/15.


Hope this helps!