Question
Peter had 3 more gold cards than black cards at first. His mother then gave him 13 gold cards and his brothers gave him 70 black cards for Christmas. Peter realised that he now had thrice as many black cards as gold cards. How many cards did Peter have in the end?
4 m

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Peter had 3 more gold cards than black cards at first. His mother then gave him 13 gold cards and his brothers gave him 70 black cards for Christmas. Peter realised that he now had thrice as many black cards as gold cards. How many cards did Peter have in the end?