Question
Mr Brandon had 70 ping pong balls. He gave 15 of his ping pong balls to Ben. During the practice, Mr Brandon lost 4 ping pong balls. How many ping pong balls did Mr Brandon have in the end?
4 m

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Mr Brandon had 70 ping pong balls. He gave 15 of his ping pong balls to Ben. During the practice, Mr Brandon lost 4 ping pong balls. How many ping pong balls did Mr Brandon have in the end?