NAGOYA (Kyodo) A third-grade elementary school teacher in Okazaki, Aichi Prefecture, has been reprimanded for asking a class the number of days it would take to kill 18 kids if three were killed each day, the local board of education said Wednesday.

The 45-year-old male teacher admitted to posing the math problem when school authorities asked him about it, according to the board. The board was tipped off by a person believed to be a parent of one of his students.

During a class in July, the teacher asked, “How many days does it take to kill all 18 kids when killing three a day?”

He reportedly told the school authorities that the words just slipped out of his mouth.

He received the reprimand from the board on July 16, but the board did not make the incident public for about two months because “the teacher’s behavior was not continuous and the students weren’t hurt psychologically by it,” a board official said.

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