Question

A program on television ran 30 minutes. The program ran seven minutes longer than three times the length of the commercials. Use the guess and check method to find the number of minutes the commercials ran during the program.

A. 12.3
B. 3.7
C. 7.7
D. 22.3

Answer 1

Let c represent the total time during which commercials appeared.
Then 3c+7 = program time = 30 minutes total

Then 3c = 23 minutes, and c = 7 2/3 minutes. This is close to 7.7.