Mathematics

Mathematics, 04.02.2021 14:00, caliharris123

There are only black pens and green pens in a box. The ratio of the number of black pens in the box to the number of green pens in the box is 2:5
What fraction of the pens are black?

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There are only black pens and green pens in a box. The ratio of the number of black pens in the box...

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