Question

Roy worked for 2 hours and earned $12. How many hours must he work at the same rate to earn $36?

Answer 1

6 hours to earn 36 dollars because 6×6=36

Answer 2

You do a proportion.
2 hours/$12 = 6 hours/$36

I got 6 hours by dividing the 36 by 6. I did that because 2•6=12