# 40% of the boys, 70% of the girls in a class attend a picnic and ratio of boys to girls in the class is 3:2 if the number on the picnic was 27. How many are there in the whole class?

##### 1 Answer

The total is approx.

#### Explanation:

Let

Moreover, we know that the ratio between boys and girls is

which leads to

substitute this expression in the one we wrote before to get

you can reduce the equation to get

and thus

Plug this result in the boys-to-girl ratio to get

So, the total is