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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

In an 8-gram solution of water and alcohol, the ratio by mass of water to alcohol is 3 to 1. If 12 grams of a solution consisting of 2 grams water for each gram of alcohol is added to the 8-gram solution, what fraction by mass of the new solution is alcohol?

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How many grams of alcohol are in the final 20-gram solution? First find how many grams of alcohol are in each of the two solutions that make up the final solution.

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