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?

Question

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?

terenzreignz · Answer

Partitive proportion? 
Ten gallons of green paint, with two parts yellow and three parts blue:
Let x be one part of paint
Then 
3x + 2x = 10
         5x = 10
          x = 2

Therefore, since one part is two gallons, and there are two parts yellow, then
4 gallons of yellow paint is needed :)

anonymous · Answer

so i have to use a propotion to solve it

terenzreignz · Answer

I'd think so :)