Question

Martin uses 5/8 of a gallon of paint to cover 4/5 of a wall. What is the unit rate at which Martin paints in walls per gallon?

a.1/2 wall per gallonB)32/25 walls per gallonC)1 7/25 walls per gallonD)1 3/32 walls per gallon

Answer 1

You can easily solve this by setting up a proportion with walls on the top and paint on the bottom. First we can find the decimal equivalent of each of those fractions to make things easier. 5/8 = .625 and 4/5 = .8.
`(w)/(p) : (.8)/(.625)= (x)/(1)`. What this is asking is "if 4/5 (.8) of a wall is covered by 5/8 (.625) of a gallon of paint, how many walls (x) will 1 gallon of paint cover?" If we cross multiply we have .625x = .8 and x = 1.28 which is the same as 1 7/25 walls/1 gallon, choice C.

Answer 2

A: 32/25 and B: 1 7/25

Explanation: