Alani earned $45 for 3 hours of baby-sitting. At the same rate, for how many hours would she need to baby-sit to earn $75?
The rate is $45/3=$
<gadget id="calculator">45/3</gadget>
<output>15</output>
15/hr.
She would need to baby-sit for $75/$15=
<gadget id="calculator">75/15</gadget>
<output>5</output>
5 hours.

<result>5</result>