Kobayashi bought 5 balls, gave the salesperson 50 yuan, got back 10 yuan, how much is each ball? (solution by equation)
小林买了5个皮球，给了售货员50元，找回10元，每个皮球多少元？(用方程解)
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<result>8</result>