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Billymkhoi
We have an equation: 1/? = 16/80

Cross multiply:
16*? = 80*1
⇒ ? = 80*1/16= 5

5 fluid ounces of vinegar should be mixed with 80 fluid ounces of water~
80/16 equals to 5
5 fluid ounces of vinegar should be mixed with 80 fluid ounces of vinegar.

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