Question
Harry had 10 more green marbles than yellow marbles at first. His aunt then gave him 11 green marbles and his sisters gave him 91 yellow marbles for Christmas. Harry realised that he now had thrice as many yellow marbles as green marbles. How many marbles did Harry have in the end?
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Harry had 10 more green marbles than yellow marbles at first. His aunt then gave him 11 green marbles and his sisters gave him 91 yellow marbles for Christmas. Harry realised that he now had thrice as many yellow marbles as green marbles. How many marbles did Harry have in the end?