Joey has 30 pages to read for history class tonight. He decided that he would take a break when he finished reading 70% of the pages assigned. How many pages must he read after he takes a break?
Joey will take a break after 30 * 0.7 = 
<gadget id="calculator">30*0.7</gadget>
<output>21</output>
21 pages.
Joey will have to read 30 - 21 = 
<gadget id="calculator">30-21</gadget>
<output>9</output>
9 pages more.

<result>9</result>