Question 1143037
x gal of 25%
20-x gal of 5%
pure alcohol is x(.25)+(20-x)(.05)=20*.16=3.2
so .25x+1-.05x=3.2 gallons of 25%
.20x=2.2 gallons of 5%
x=11 gallons of 25% or 2.75 gallons of pure alcohol
20-x=9 gallons of 5% or 0.45 gallons of pure
That equals 3.2 gallons pure, checks.