算数の問題の意味は？

Question

算数の問題だったのですが分からなくて、、
こちらです↓よければ教えてくださるとありがたいです。
Mary needs to order pizza for 18 students. Each student should get ¼ of a pizza. How many pizzas should Mary order? How much pizza will be left over?

Kevin@MusicoLingo · Answer

Each pizza will be enough for 4 students. 4 pizzas for 16 students. 5 pizzas for 20 students. Mary should order 5 pizzas, and the leftover will be for 2 students, which is 1/2 of a pizza.

数式を使うなら、いろんな書き方ができますが、一例を挙げます。

18 ÷ 4 = 4 R 2
18 divided by 4 equals 4 with a remainder of 2

This means that 2 students will not be able to eat if Mary orders 4 pizzas. So she should order 5 pizzas.

4 x 5 = 20
20 = 18 + 2

There will be a leftover for 2 students if Mary orders 5 pizzas. It is 1/2 of a pizza.

算数の問題の意味は？

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