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Eight out of 10 dentists prefer whitening toothpaste. What is the ratio of dentists who do not prefer whitening toothpaste to those who do.
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Eight out of 10 dentists prefer whitening toothpaste. What is the ratio of dentists who do not prefer whitening toothpaste to those who do.

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If 8/10 prefer whitening toothpastes,
then 2/10 do not.

So the ratio is 2:8 = 1:4
User Folyd
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