Question

Match the following equation to the correct situation.

20%(b − 22) = 20%b − 4.4
A.
Last month's electricity bill was 4.4 kW-h less than 20% of this month's bill.

B.
A number of cups of coffee were thrown away by 20% of b senators during 4.4 speeches.

C.
A number of songs are available for download from 20% of b artists.

D.
An amount of chili was eaten from 20% of 4.4 less than b bowls.

Answer 1

A.

Reason: Let b be this month's electricity use (kW·h). Then last month's use was b − 22, and 20% of last month's use equals 20% of this month's use minus 4.4 (0.2·22 = 4.4), which matches the equation.