Question
There was an equal number of purple and brown marbles in a box at first. After 25 brown marbles were taken out and 31 purple marbles were added into the box, there was 15 as many brown marbles as purple marbles. Find the number of brown marbles in the box at first.
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There was an equal number of purple and brown marbles in a box at first. After 25 brown marbles were taken out and 31 purple marbles were added into the box, there was 15 as many brown marbles as purple marbles. Find the number of brown marbles in the box at first.