Lazy Yangyang and Mei Yangyang buy exercise books. Beautiful Yangyang bought 5 copies, Lazy Yangyang bought 3 copies, and Lazy Yangyang bought snacks with 60 cents less than Beautiful Yangyang. How much is each exercise book.
懒羊羊和美羊羊买练习本．美羊羊买了5本，懒羊羊买了3本，懒羊羊把比美羊羊少用的6角钱买了零食．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>