Enrique drank 2 3/16 cups of coffee in 2 1/2 hours. how much coffee did he drink each hour? a. 4⁄5 of a cup b. 1 1⁄8 cups c. 5 15⁄32 cups d. 7⁄8 of a cup

Remark

This is sort of like a problem using d=r*t. The formula would be somewhat the same.

Givens

t  = 2 1/2 hours

C = Cups of coffee = 2 3/16

R = ??

Formula

C = R * T

Solution

2 3/16 = R * 2 1/2  Change to decimals

2.1875 = R * 2.5    Divide both sides by 2.5

R = 2.1875 / 2.5

R = 0.875 cups / hour

That's the same thing as 7/8 cup (just run through the answers with a calculator if you are not sure where that comes from).