Owen Mixes purple paint. He uses 3 pints of blue paint for every 5 pints of red paint. He has 17 1/2 pints of red paint. How much blue paint does he need? (proportion)

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25-10-2016
Mathematics

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Owen Mixes purple paint. He uses 3 pints of blue paint for every 5 pints of red paint. He has 17 1/2 pints of red paint. How much blue paint does he need? (proportion)

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pphreadpphread pphreadpphread · Answer 1 · 2016-10-25T02:50:33+02:00

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25-10-2016

Since the ratio is 3:5 blue:red and we have the red amount we can divide by the red side of the ratio and then multiply by the blue side.
17.5 / 5 = 3.5
3.5 * 3 = 10.5

Or alternatively you can change the ratio to a decimal. 3 / 5 = .6
Now multiply times the red amount. 17.5 * .6 = 10.5

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