Carla's brush is 12 inches long. If Carmen's brush is 50% longer than Carla's brush, how long is Carmen's brush in centimeters? (There are 2.5 centimeters per inch.)
First find the length of Carmen's brush in inches: 150% * 12 inches = 
<gadget id="calculator">150*.01*12</gadget>
<output>18</output>
18 inches.
Then convert the length from inches to centimeters: 18 inches * 2.5 centimeters/inch = 
<gadget id="calculator">18*2.5</gadget>
<output>45</output>
45 centimeters.

<result>45</result>