Question
Yoko and Eva have some stamps. If Yoko gives 12 stamps to Eva, Eva will have 4 times the number of stamps as Yoko. If Eva gives 15 stamps to Yoko, Yoko will have 25 as many stamps as Eva. How many stamps does Yoko have at first?
4 m

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Yoko and Eva have some stamps. If Yoko gives 12 stamps to Eva, Eva will have 4 times the number of stamps as Yoko. If Eva gives 15 stamps to Yoko, Yoko will have 25 as many stamps as Eva. How many stamps does Yoko have at first?