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If 8/11 pens are blue, then 3/11 are black.

There are 12 black pens, so 12/(3/11) = 44. So there are 44 pens total.

44 * (8/11) tells us that 32 pens are black.

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Michael Scalise

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Q: 8/11 of the pens in the are blue. The rest are black. There are 12 black pens. How many pens are blue?
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