This elementary school math controversy abroad: how many people were on the train at first? -Elementary, mathematics-IT information

On a passenger train, 19 people at the first station, 17 people on the bus, now 63 people on the train. On the train, at the beginning how many people?

Seems so simple question, some foreign friends have fallen out. According to the keepers, in recent days, foreign a grade two math problems has fueled heated debate in social networks, many adults are not "standard answer" raise questions.

The problem to the problem is simple: on a passenger train, 19 people at the first station, 17 people on the bus, now 63 people on the train. On the train, at the beginning how many people?

From the normal thinking, the correct answer should be: 63-17+19=65 people . But the uploader says the answer to the problem is wrong, "19 people got off at the first stop" this section is used to confuse the calculations can be ignored, so the answer is: 63-17=46, in other words, are now to evaluate how many passengers were on the bus from the beginning to now, so the final answer is 46.

There are also many netizens criticized the problem of semantic vagueness question and believe the answer is 65. Exactly how the correct answer should be calculated?

这道国外小学数学题惹争议：刚开始火车上有多少人？ - 小学,数学 - IT资讯

一列载客火车上，19人在第一个站下车，17人上车，现在火车上有63人。究竟火车上，开始时有多少人呢？

看似如此简单的问题，国外的一些网友却吵翻了天。据中新网报道，近日，外国一份小学二年级的数学题在社交网络上引起网友的热议，不少大人都算不出“标准答案”，引发质疑。

这道题的题目很简单：一列载客火车上，19人在第一个站下车，17人上车，现在火车上有63人。究竟火车上，开始时有多少人呢？

从正常的思维来讲，正确答案应该是：63-17+19=65人。但是这道题的上传者却表示这个答案是错误的，“19人在第一个站下车”这一段，其实是用来混淆视听，计算时可以不去理会，故答案是：63-17=46，换言之，是要计算现在车上有多少乘客是从一开始坐到现在所以最终的标准答案应该是46。

也有不少的网民批评这道题的出题语义含糊不清，并坚信答案是65。到底正确答案应该怎么计算呢？