Mixture A is 10 percent alcohol, and mixture B is 40 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 20 percent alcohol, approximately how many gallons of mixture A are in the mixture?
Choose the most appropriate option
A) 1.6  B) 1.7  C) 1.8  D) 1.9  E) 2.0
(40-20)/(20-15) = Qa/Qb   20/10 = Qa/Qb   2/1 = Qa/Qb   Qa = (2/5) * 4 = 8/5= 
<gadget id="calculator">8/5</gadget>
<output>8/5 = around 1.6</output>
1.6 approx   1.6nswer : 1.6
<result>A</result>
Mixture A is 10 percent alcohol, and mixture B is 40 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 20 percent alcohol, approximately how many gallons of mixture A are in the mixture?