Json has 4 gallons of hand sanitizer that contains 25% alcohol. He want sto make a hand santizer that contains 50% alchahol. How many gallons of pure alcohol should he add?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.