Question

A copy machine can print 780 copies every 4 minutes. A teacher printed 2,925 copies. How many minutes did it take?

A) 8 minutes
B) 12 minutes
C) 16 minutes
D) 20 minutes

Answer 1

The number of minutes is 16 minutes. Option C

To determine the number of minutes, we have to know the law of proportion

Since, we have that the copy machine can print 780 copies in 4 minutes, for the teacher to print 2925 copies, we would have that;

If 780 copies = 4 minutes

Then 2925 = x minutes

cross multiply the values, we get;

x = 2925 ×4/780

Multiply the values

x = 11700/780

Divide the values

x = 16 copies