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?
The total is approx.
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
Plug this result in the boys-to-girl ratio to get
So, the total is