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17-10-2019
Mathematics

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The ratio of red to black pens in a box is 1:3. If there are 480 pens in the box altogether how many black pens are in the box?

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17-10-2019

Answer: 320 black pens

Step-by-step explanation:

480 ÷ 3 = 160

160 red pens

Then you have

160 + 160 = 320 black pens

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