green paint is made by mixing 5 pints of blue paint and 2 pints of yellow paint. How pints of blue paint are needed to make 28 pints of green paint?

Question

I have been having trouble about this question and am really confused.

Answer 1

5 pints of blue and 2 pints of yellow make 7 pints of green. (5 + 2 = 7)

You must do this four times to get 28 pints of green. (4  · 7 = 28)

So you need 20 (4 · 5) pints of blue and 8 (4 · 2) pints of yellow.