Mass box a = 10 grams; mass box b = 5 grams; mass box c—made of one a and one b mass ratio a/b =

mass ratio of A/B is 2:1

Explanation:

Since the mass of box A = 10g

                mass of box B = 5g

   Mass of box C = mass of box A + mass of box

A ratio compares two quantities. To find the ratio of the two boxes:

  Ratio of A to B =

  Ratio of A to B = = 2

The mass ratio is 2:1 i.e box A has twice the mass of B