Liza reads 20 pages in an hour, and Suzie reads 15 pages in an hour. How many more pages does Liza read than Suzie in 3 hours?
In 3 hours, Liza reads 20 x 3 = 
<gadget id="calculator">20*3</gadget>
<output>60</output>
60 pages.
In 3 hours, Suzie reads 15 x 3 = 
<gadget id="calculator">15*3</gadget>
<output>45</output>
45 pages.
Liza reads 60 - 45 = 
<gadget id="calculator">60-45</gadget>
<output>15</output>
15 pages more than Suzie.

<result>15</result>