Question

A copy machine can print 340 color copies every 8 minutes. Explain or show your reasoning.

A teacher printed 850 copies. How long did it take to print?

Answer 1

Simple:
340 copies every 8 minutes
Find copies per minute
340 / 8 = 42.5 copies/min
Now, to find out how long it took to print all 850 copies;
850 / 42.5 = 20 min.
It took 20 minutes.
Or
(850*8) / 340 = 20

Answer 2

Explanation:

340=8min

850=?(x)

340x=850×8

340x=6800

x=6800/340

x=20min

so..the teachertook 20 minute to print 850 copies