Fred catches 25 fish. Then he releases 10 fish and catches 8 more. - (25-10) + 8, Nick has 25 pens. He gives 10 pens to one friend and 8 pens to another. - 25 - (10 + 8), Jan catches 15 fish and lets 6 go. - 15 - 6, Libby catches 15 fish and lets 6 fish go for three d - 3 x (15 - 6)Libby catches 15 fish and lets 6 fish go for three days in a row.,

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