Xiaohong and Xiaoqiang buy exercise books. Xiaohong bought 5 copies, Xiaoqiang bought 3 copies, and Xiaoqiang spent 60 cents less than Xiaohong. How much is each exercise book.
小红和小强买练习本．小红买了5本，小强买了3本，小强比小红少用了6角钱．每本练习本多少角钱．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>