Question
Mr Justin had 64 ping pong balls. He gave 12 of his ping pong balls to Tim. During the practice, Mr Justin lost 4 ping pong balls. How many ping pong balls did Mr Justin have in the end?
4 m

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Mr Justin had 64 ping pong balls. He gave 12 of his ping pong balls to Tim. During the practice, Mr Justin lost 4 ping pong balls. How many ping pong balls did Mr Justin have in the end?