Question 164341
6*.75+x=.80(6+x)
4.5+x=4.8+.8x
x-.8x=4.8-4.5
.2x=.3
x=.3/.2
x=1.5 liters of pure alcohol is needed.
Proof:
6*.75+1.5=.8(6+1.50
4.5+1.5=.8*7.5
6=6