Question
Mr Sean had 56 ping pong balls. He gave 27 of his ping pong balls to John. During the practice, Mr Sean lost 4 ping pong balls. How many ping pong balls did Mr Sean have in the end?
4 m

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Mr Sean had 56 ping pong balls. He gave 27 of his ping pong balls to John. During the practice, Mr Sean lost 4 ping pong balls. How many ping pong balls did Mr Sean have in the end?