Question

You are going to mix a gallon bucket of window cleaner. The You are going to mix a gallon bucket of window cleaner. The instructions
direct you to mix 1 part cleaner to 3 parts water. How much cleaning 
solution will you need to use?*

Answer 1

X-amount of cleaning soulution
1Gal=x+3x
1Gal=4x
x=1/4 Gal

The amount of solution needed will be 0.25 Gal.
Hope it helped!