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Mathematics, 31.05.2021 14:00 fernandezvela27

in a box of pens, 30% of them are blue, 45% are red and the rest are black. if there are 360 red pens, find the total number of pens.

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in a box of pens, 30% of them are blue, 45% are red and the rest are black. if there are 360 red pen...
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