Question

A fruit recipe requires 2 apples and 3 Mangoes.A baker has 37 Mangoes.What is the smallest number of apples he will need to bake as many fruit tarts as possible?

Answer 1

With 37 mangoes you can bake 12 fruit tarts, because you need 3 mangoes for each tarts and you'll use $12\cdot 3 = 36$ mangoes. The remaining mango is not enough for another tart.

On the other hand, in order to bake 12 tarts, you'll need 24 apples, because you need 2 apples per tart.

So, with 12 apples and 37 mangoes you can bake 12 tart, with one mango as leftover.