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90 proof means the alcohol content is 45%, by volume.
200 proof = 100%
180 proof = 90%
and so on.

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15y ago

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More answers

45%

The percentage of alcohol content is determined by halving its' proof.

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15y ago
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80%

Calculation below

70/100+90/100=160/200=.8

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Wiki User

14y ago
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45% by volume. Proof goes to 200.

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15y ago
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Q: What is 90 proof alcohol?
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