95% alcohol is equal to which combination of other alcohols?

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Multiple Choice

95% alcohol is equal to which combination of other alcohols?

Explanation:
Mixing solutions with different concentrations changes the final percentage according to a weighted average. To reach 95% final from an 80% isopropyl alcohol and 100% methanol, use a ratio that tilts toward the higher concentration. If you mix one part of 80% IPA with three parts of 100% methanol, the final concentration is (0.80×1 + 1.00×3) / (1+3) = 3.8/4 = 0.95, or 95%. This demonstrates how a 95% solution can be formed by combining two alcohols with different concentrations. The other options don’t describe a mixture resulting in 95%: a standalone 70% ethanol isn’t a combination, a 50% propyl alcohol by itself isn’t 95%, and a 95% ethyl alcohol is already at the target without combining with another alcohol.

Mixing solutions with different concentrations changes the final percentage according to a weighted average. To reach 95% final from an 80% isopropyl alcohol and 100% methanol, use a ratio that tilts toward the higher concentration. If you mix one part of 80% IPA with three parts of 100% methanol, the final concentration is (0.80×1 + 1.00×3) / (1+3) = 3.8/4 = 0.95, or 95%. This demonstrates how a 95% solution can be formed by combining two alcohols with different concentrations.

The other options don’t describe a mixture resulting in 95%: a standalone 70% ethanol isn’t a combination, a 50% propyl alcohol by itself isn’t 95%, and a 95% ethyl alcohol is already at the target without combining with another alcohol.

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