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Bob has a marble collection. After Bob got another 15 marbles, he gives away 1/5 of...

Bob has a marble collection. After Bob got another 15 marbles, he gives away 1/5 of his marbles. Then Bob has 32 marbles. How many marbles did Bob have at first? Solve this problem in two ways: with the aid of a strip diagram and with algebraic equations, explaining each briefly.

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