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Mathematics, 26.06.2019 11:30 lyly214

Abag contains 60 marbles. some are red and the rest are black. there are 9 red marbles for every black marble (1 black marble). how many red marbles are in the bag?

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Abag contains 60 marbles. some are red and the rest are black. there are 9 red marbles for every bla...
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