30 students are going to visit the Shiitake Mushroom Museum. They want to buy mineral water. If they buy 5 bottles, they will get 1 free. How much will they pay for the bottle of mineral water?
30名学生去香菇博物馆参观，要买矿泉水，商店买5瓶送1瓶，那么他们要付多少瓶矿泉水的钱？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>