If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution

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sambati: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Tue Jul 21, 2020 10:14 am

by sambati » Tue Aug 04, 2020 1:55 pm

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If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution, what percentage of the original alcohol was replaced?

A 3%
B 20%
C 66%
D 75%
E 80%

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Source: Beat The GMAT — Problem Solving | Tue Aug 04, 2020 1:55 pm

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