Say you have 5 coins, and you get 2 more coins. How many coins will you have?
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「乗客は何人?」7歳向けの “算数の問題” に混乱する大人続出 | ロケットニュース24
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。。。原文を読んでいませんね。
There were some people on a train
19 people get off the train at the first stop
17 people get on the train
Now there are 63 people on the train
How many people were on the train to begin with?
"How many people are on the train from the beginning ?" Who said so?