Question
Three girls, Diana, Hazel and Abi had a total of 1200 cards. Some exchanges were made. First, Diana gave Hazel as many cards as Hazel had. After that, Hazel gave 13 of whatever she had then to Abi. Finally, Abi gave 13 of whatever she had to Diana. As a result, they each had the same number of cards. How many cards did Diana have at first?
5 m

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Three girls, Diana, Hazel and Abi had a total of 1200 cards. Some exchanges were made. First, Diana gave Hazel as many cards as Hazel had. After that, Hazel gave 13 of whatever she had then to Abi. Finally, Abi gave 13 of whatever she had to Diana. As a result, they each had the same number of cards. How many cards did Diana have at first?