Audrey's key lime pie calls for 1/4 cup of key lime juice but she likes to double this amount to make it extra tart.  Each key lime yields 1 tablespoon of juice.  There are 16 tablespoons in 1 cup.  How many key limes does Audrey need?
Her recipe calls for 1/4 cup of juice but she wants to double that so she needs 1/4+1/4 = 1/2 cup of lime juice
16 tablespoons are in 1 cup and she only needs 1/2 cup so she needs 16*.5 = 
<gadget id="calculator">16*.5</gadget>
<output>8</output>
8 tablespoons of juice
1 key lime yields 1 tablespoon of juice and she needs 8 tablespoons so she needs 1*8 = 
<gadget id="calculator">1*8</gadget>
<output>8</output>
8 key limes.

<result>8</result>