Mathematics, 10.02.2021 15:50, robertobi5397

Some red and some black pens area sold in packages of 20. The red pens are worth 50 cents each and the black pens are worth 30 cents each. The package of twenty pens is worth $8.20. How many black
pens are in the package?

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Some red and some black pens area sold in packages of 20. The red pens are worth 50 cents each and...