Mathematics

Mathematics, 01.09.2020 23:01, mooncake9090

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 WITH A STEP BY STEP EXPLANATION PLEASE

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