Question

It takes 12 hours to clean the windows of a certain office building. During the first day of cleaning, the workers were able to clean for 9 hours. If the variable t stands for the amount of time the workers have left to clean the windows, which of the following choices is the most reasonable value for t?

A.
3 hours

B.
1 hour

C.
30 hours

D.
20 hours

Answer 1

If you would like to know which of the following choices is the most reasonable value for t, you can calculate this using the following step:

t ... the amount of time the workers have left to clean the windows
t = 12 hours - 9 hours = 12 - 9 = 3 hours

The correct result would be A. 3 hours.

Answer 2

the most reasonable value for t would be A. 3 hours.

Since it would take 12 hours to clean the place and the workers already cleaned for 9 hours, there is still 3 hours left to completely clean the office building. (12 - 9 = 3)