Mark made a chalkboard that is 3 feet wide. It is 2 times as long as it is wide. What is the area of the chalkboard?
The length of the chalkboard is 2 x the width of 3 feet = 
<gadget id="calculator">2*3</gadget>
<output>6</output>
6 feet.
We can calculate area by multiplying the width and the length, so 3 feet x 6 feet = 
<gadget id="calculator">3*6</gadget>
<output>18</output>
18 feet.

<result>18</result>