Mathematics, 31.08.2020 23:01 fabiolafrancklin10

In a box, there are black pens, red pens and green pens the ratio of black pens to not black pens is 9:11
the ratio of green pens to not green pens is 3:5
fins the ratio of black pens to red pens to green pens

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In a box, there are black pens, red pens and green pens the ratio of black pens to not black pens i...