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30-08-2018
Mathematics

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the only black pens and green pens in a box the ratio of a number of black pens in the box to the number of green pens in the box is to 5 what fraction of pens are black

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Аноним Аноним

30-08-2018

Fraction of black pens = 2/ (2 + 5) = 2/7 answer

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