Question
Sam has 7 black marbles and some yellow marbles. Then his brother gave him 10 more yellow marbles and he has a total of 24 marbles. How many yellow marbles did he have at first?
4 m

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Sam has 7 black marbles and some yellow marbles. Then his brother gave him 10 more yellow marbles and he has a total of 24 marbles. How many yellow marbles did he have at first?