Question 195662
"How many gallons of a 40% alcohol solution must be mixed with 40 gallons of a 22% solution to obtain a solution that is 30% alcohol?"


----> *[Tex \LARGE 0.4x+40(0.22)=(x+40)(0.3)]


*[Tex \LARGE 0.4x+8.8=0.3x+12]



*[Tex \LARGE 0.4x-0.3x=12-8.8]



*[Tex \LARGE 0.1x=3.2]



*[Tex \LARGE x=\frac{3.2}{0.1}]



Ans: *[Tex \LARGE x=32]