An orphaned kitten was only 4 inches when he was found. In the next two weeks, he doubled in length, and by 4 months old, he had double in length again. What is its current length?
In two weeks, the kitten measured 4 x 2 = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 inches.
4 months later, the kitten measured 8 x 2 = 
<gadget id="calculator">8*2</gadget>
<output>16</output>
16 inches.

<result>16</result>