Training for Intervention ProcedureS (TIPS) Certification Practice Exam

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How many ounces of 100-proof spirits have 1/2 oz of pure alcohol?

4 oz
1 oz
3 oz
2 oz

The correct answer is: 4 oz

To determine how many ounces of 100-proof spirits contain 1/2 oz of pure alcohol, one must first understand what 100-proof means. In the United States, a spirit that is 100-proof contains 50% alcohol by volume (ABV). Given that 100-proof spirits have 50% pure alcohol, if you have a total volume of a certain number of ounces of these spirits, only half of that volume will be pure alcohol. Therefore, to find out how many ounces of 100-proof spirits are necessary to achieve 1/2 oz of pure alcohol, you can set up the equation: Let x be the number of ounces of 100-proof spirits. Since 50% of x is pure alcohol, you arrive at the equation: 0.5 * x = 0.5 oz (pure alcohol). To solve for x, divide both sides of the equation by 0.5: x = 0.5 oz / 0.5 = 1 oz. Total ounces of 100-proof spirits calculated gives you 1 oz, which aligns with the understanding that since you need to reach 1/2 oz of pure alcohol and you are working with a spirit that is half alcohol