Preparation requires X,Y,Y in proportion 5:2:1. How many gallons can be made from 25X, 20Y, 8Z?

Question

A certain preparation requires liquids X, Y, Z in the proportion 5:2:1. How many gallons of the prepartation can be made from 25 gallons of X, 20 gallons of Y, and 8 gallons of Z.
.25
.40
.80
.53
.05
cannot tell form the information given

Answer 1

Normalize the given quantities with respect to their weights
25 of x divided by 5 = 5
20 of y divided by 2 = 10
8 of z divided by 1 = 8

therefore the largest quantity one could make is 5 gallons which would use
5x5 = 25 gallons of x
2x5 = 10 gallons of y
1x5 = 5 gallons of z

which is the last answer.

I assume those decimals should not be there.