Question
Albert had 5 more grey buttons than yellow buttons at first. His mother then gave him 15 grey buttons and his colleagues gave him 84 yellow buttons for Christmas. Albert realised that he now had thrice as many yellow buttons as grey buttons. How many buttons did Albert have in the end?
4 m

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Albert had 5 more grey buttons than yellow buttons at first. His mother then gave him 15 grey buttons and his colleagues gave him 84 yellow buttons for Christmas. Albert realised that he now had thrice as many yellow buttons as grey buttons. How many buttons did Albert have in the end?