60 students go to the garden, and each of them wants to drink a bottle of mineral water. The store buys 4 bottles and gets 1 free, so they only need to pay for how many bottles they buy.
60名学生去游园，他们每人想喝1瓶矿泉水．商店买4瓶送1瓶，那么他们只需要付钱买的有多少瓶．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">60 - 12</gadget>
<output>48</output>

<result>48</result>