Thom worked 20 hours last week at the sporting-goods store and earned $155.00. if he continues to earn the same hourly pay, how many additional hours must he work to earn another $217.00?

Ok so I would set it up like this   20        x
                                                   $155 = $217 then cross multiply 20 times 217 = 4340 so you are left with $155x=4340 solve for x, so divide $155 by both sides and get x=28. So Thom has to work 28 extra hours to get $217.00.