Mixture A is 40 percent alcohol, and mixture B is 80 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 50 percent alcohol, approximately how many gallons of mixture A are in the mixture?
Choices.
A) 1.5  B) 1.7  C) 2.3  D) 2.5  E) 2.4
(80-50)/(50-40) = Qa/Qb   30/10 = Qa/Qb   3/1 = Qa/Qb   Qa = (3/5) * 4 = 12/5= 
<gadget id="calculator">12/5</gadget>
<output>12/5 = around 2.4</output>
2.4 approx   Answer : 2.4
<result>E</result>
Mixture A is 40 percent alcohol, and mixture B is 80 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 50 percent alcohol, approximately how many gallons of mixture A are in the mixture?