Four gallons of yellow paint plus two gallons of red paint make orange paint. I assume this makes six gallons. So the ratio is 4:2, or 2:1.
Question: how many gallons of yellow paint, and how many gallons or red paint, to make two gallons of orange paint?
2y + r = 2 2y + y = 2 3y = 2 y = 2/3
4y + 2r = 6 (4y + 2r)/3 = 2
so I get 4/3 and 2/3.
However, in this section of the text book, I'm not sure that it's "allowed" to do any of that. Is it possible to solve this just with cross-multiplying a ratio?
Their examples setup a ratio with an unknown
n, cross multiply and solve for
n. I don't see how to solve this word problem with that technique.