Question
Mr Fred had 80 tennis balls. He gave 15 of his tennis balls to Tom. During the practice, Mr Fred lost 4 tennis balls. How many tennis balls did Mr Fred have in the end?
4 m

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Mr Fred had 80 tennis balls. He gave 15 of his tennis balls to Tom. During the practice, Mr Fred lost 4 tennis balls. How many tennis balls did Mr Fred have in the end?