Heuristic Skill - Equal Total

Dear all,
Please try out this questions on your foolscap or rough paper. We will discuss it tomorrow.

1. Two classes, Primary 6A and Primary 6B, have the same number of pupils each. The rtio of the number of boys in Primary 6A to the number of boys in Primary 6B is 1 : 3. The ratio of the number of girls in Primary 6A to the number of girls in Primary 6B is 4 : 1. What is the ratio of the number of girls in Primary 6A to the number of boys in Primary 6B?

(Hint - Draw Models)

Regards,
Mrs Mak