I found this ambiguous a bit.

Is the query about the gray paint or any of black or white paints to be purchased?

It is clear that for two gallons : W : B = 0.75 : 1.25 That means for 4 gallons = 1.5 : 2.5

The least amount of White paint is 1.5.

The least amount of Black paint is 2.5.

The least amount of Gray paint is 4.

What is the answer - B or E? I got confused a bit.

chunjuwu wrote:

A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of back paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half-gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture?

(A)2 (B) 5/2 (C)3 (D) 7/2 (E) 4

please explain, thank you.

_________________

Awaiting response,

Thnx & Rgds,

Chandra