IQ Brain Teaser #186

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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