Mathematics, 08.01.2021 04:50, lippj0228

The ratio of red pens to black pens is 2:9, the ratio of black pens to blue pens is 5:4. Show less than 50% of the pens are black

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The ratio of red pens to black pens is 2:9, the ratio of black pens to blue pens is 5:4. Show less t...