学校买矿泉水，24元一箱，买5箱赠1箱，要买24箱，一共要用多少钱？

数学题解答：买5箱送一箱，那就是6箱了：5+1＝6（箱）。24箱里总共有几个6箱？24÷6＝4（个），所以5箱5箱地买，买4次就可以了。

需要付的钱是：24×5×4＝480（元）答：一共要用480元。

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