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There are five sheep and eight cows on board. How old is the captain? What's the problem?
"A ship has 13 cows and 6 sheep. How old is the captain this year? " How to fill in the answer to such a nonsense math problem? Yesterday, some netizens exposed a math problem in the first grade of a primary school in Nanjing, and the answer became the focus of controversy among netizens.

The reporter learned from the teacher that there is no solution to this problem, only to cultivate students' questioning spirit and exercise their way of thinking. (May 8, Jinling Evening News) Recently, a math test paper from a primary school in Nanjing was posted online, which attracted the attention of netizens. This topic called "mystery" stumped many people, including undergraduates, white-collar workers in companies, civil servants and even some graduate students.

Some netizens joked that "this question should have an answer. Calculate the weight according to the number of sheep and cattle, then calculate what ship it is, and finally calculate the age of the captain according to relevant regulations.

A child wrote the answer "19", but the teacher made a big red cross. In this regard, some netizens put forward "please ask the teacher to announce the correct answer." The teacher responded, "This problem is not solved. The purpose of the problem is to cultivate children's questioning spirit and exercise methods."

Such "mystery" and "answer" inevitably make people feel "played". So, is this kind of education really good for the first-grade primary school students? Can they really accept it? Will it be "counterproductive"? These problems deserve our deep thought.