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Levi has 20 pens. All of the pens are either blue or black, and there are 12 more blue pens than black pens. How many blue pens does Levi have?
3 years ago

Answers

oobleck
If there are x blue pens, then there are x-12 black pens.
x + x-12 = 20
find x
3 years ago

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