During the promotion period of Jiale Supermarket, buy 4 bottles of soda and get 1 free. Lele and his 9 classmates each want to drink 1 bottle of soda, so they only need to buy as many bottles of soda.
家乐超市促销期间，汽水买4瓶送1瓶，乐乐和他的9个同学每人想喝1瓶汽水，那么只需买多少瓶汽水．
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

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

<result>8</result>