# Find the percent of boys and girls

I have a basic school academic question which despite of trying very hard I was unable to find a solution -

Average score of girls is an exam is $67$ and that of boys is $62$. Find the percentage of girls and boys?

I think the question is incomplete - cause average is nothing but addition of each student marks divided by total number of student - and I was never able to find the solution - is my understanding correct - does an answer exists?