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Mathematics, 09.04.2021 16:00 cheylee123456

There are only blue pens, green pens, and red pens in a box. The ratio of the number of blue pens to red pens is 4:1.

The ratio of the number of red pens to green pens is 5:3.

There are less than 90 pens in the box. What is the greatest possible number of blue pens in the box?

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