SOLUTION: Kelly earns $36 for 3 hours of work. At that rate, how long will she have to work to earn $720?

Question 1128194: Kelly earns $36 for 3 hours of work. At that rate, how long will she have to
work to earn $720?
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
Kelly earns $36 for 3 hours of work. At that rate, how long will she have to
work to earn $720?

$36 IS TO 3 hours AS $720 IS TO X hours.

"IS TO" means "OVER".  "AS" means "EQUALS"

$36 OVER 3 hours EQUALS $720 OVER X hours.



CROSS MULTIPLY, that is, 

"UPPER LEFT times LOWER RIGHT equals UPPER RIGHT times LOWER LEFT":





Divide both sides by $36

 

 

Answer: 60 hours

Edwin

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