A shade of green paint is to be mixed with 3 parts blue and 2 parts yellow. Ten gallons of green paint are to be mixed. How many gallons of yellow paint must be used?

a. 4.

b. 2.

c. 5.

d. 6 2/3.

A. 4 gallons of yellow paint are used

3 parts blue + 2 parts yellow = 5 total parts

10 gallons : 5 parts = 2 gallons per part

2 gallons per part * 3 parts blue = 6 gallons blue paint

2 gallons per part * 2 parts yellow = 4 gallons yellow paint

Answer = a. 4