Question
Xuan had a total of 229 red and blue marbles. She used 45 of her red marbles and bought another 57 blue marbles. The number of blue marbles she had then become 15 the number of red marbles. How many less blue marbles than red marbles did she have at first?
4 m

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Xuan had a total of 229 red and blue marbles. She used 45 of her red marbles and bought another 57 blue marbles. The number of blue marbles she had then become 15 the number of red marbles. How many less blue marbles than red marbles did she have at first?