There are 150 students in the third and fourth grades going to the beach to play, each student eats 1 ice cream, according to buy 4 get 1 free, how many ice cream do you need to buy?
三、四年级有150名同学到海边游玩，每名同学吃1支冰淇淋，按照买4送1，需要买多少支？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<gadget id="calculator">150 - 30</gadget>
<output>120</output>

<result>120</result>