Mixture A is 20 percent alcohol, and mixture B is 50 percent alcohol. If the two are poured together to create a 15 gallon mixture that contains 30 percent alcohol, approximately how many gallons of mixture A are in the mixture?  Answers
A) 3 gallons	B) 4 gallons	C) 5 gallons	D) 10 gallons	E) 12 gallons
Let A = number of gallons on Mixture A in 15 gallon mixture   B = number of gallons on Mixture B in 15 gallon mixture   (20/100)A + (50/100)B= (30/100)(A+B) --1   A+B=15 -- 2   On solving equations 1 and 2 , we get   A=10   B=5   Answer 10 gallons 10 gallons
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Mixture A is 20 percent alcohol, and mixture B is 50 percent alcohol. If the two are poured together to create a 15 gallon mixture that contains 30 percent alcohol, approximately how many gallons of mixture A are in the mixture?