posted by Anonymous .
A certain paint is to be mixed with 3 parts yellow to 2 parts blue. Twelve gallons of mixed paint are needed.
How many gallons of blue must be used?
This is a proportional reasoning question.
The proportion is blue/total paint=blue/total paint
so the question gave you
2blue/(5 total from 2blue+3yellow) and you are asked How many blue for 12 gallons.
and solve : )
X gal. of blue.
3x/2 = 1.5x gal. of yel.
x + 1.5x = 12.
Yes, both ways have the same answer : )