Question

Jack is mixing red paint with blue paint to make purple paint. he adds 2/5 of a fluid ounce of red to 11/15 of a fluid ounce of blue to make 1 2/15 fluid ounces of purple. how many fluid ounces of red paint will he need to make 5 fluid ounces of purple paint?

Answer 1

Explanation:

Change 2/5 to a decimal

2/5 = 0.4

Change 1 2/15 of a fluid ounce to a decimal.

1.133333

Set up your proportion.

0.4 / 1.133333 = x / 5 Cross multiply

0.4*5 = 1.133333*x

2 = 1.133333 x Divide by 1.1333333

2/1.33333 = x

x = 1.5 ounces.

He needs 1.5 ounces of red to make 5 ounces of purple.