Darlene's car gets 20 miles/gallon. Martha's car gets half as many miles per gallon as Darlene’s car. How many gallons does Martha’s car require to make a 300-mile trip?
Martha's car gets 20/2 = 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10 miles per gallon.
Total gallons Martha's car requires is 300/10 = 
<gadget id="calculator">300/10</gadget>
<output>30</output>
30 gallons.

<result>30</result>