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IQ Brain Teaser #186
Mary was working in a chemistry lab with a mixture of chemicals that was 90% water and weighed 20 pounds. After returning to the lab from a weekend break, she calculated the mixture was now 50% water. How much does the mixture now weigh? For purposes of this puzzle, assume the non-water part of the mixture was not affected by evaporation.

2 pounds
4 pounds
6 pounds
8 pounds
10 pounds
12 pounds
14 pounds
16 pounds
18 pounds
20 pounds

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