Greta worked 40 hours and was paid $12 per hour. Her friend Lisa earned $15 per hour at her job. How many hours would Lisa have to work to equal Greta's earnings for 40 hours?
For the 40 hours worked, Greta earned a total of 40 * 12 = $
<gadget id="calculator">40*12</gadget>
<output>480</output>
480.
To find how many hours Lisa has to work to earn $480, we divide 480 / 15 = 
<gadget id="calculator">480/15</gadget>
<output>32</output>
32.

<result>32</result>