There are 48 students in Class 4 and 1. Under the leadership of two teachers, they went to Hua Luogeng Park. They each want to drink a bottle of mineral water, buy 4 bottles in the supermarket and get one free, they only need to buy how many bottles of mineral water.
四1班共有48位同学，在两位教师带领下去华罗庚公园．他们每人想喝一瓶矿泉水，超市里买4瓶送一瓶，他们只需要买多少瓶矿泉水．
<gadget id="calculator">48 + 2</gadget>
<output>50</output>

<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>