Xiaoping and Xiaohua each bought a number of story books, if Xiaoping gave Xiaohua 5 books, 2 less than Xiaohua, how many more books did Xiaoping buy than Xiaohua?
小平和小华各买了若干本故事书，如果小平送给小华5本后，就比小华少2本，小平原来比小华多买多少本．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>