Question 136962
.6X+.9*90=.8(90+X)
.6X+81=72+.8X
.6X-.8X=72-81
-.2X=-9
X=-9/-.2
X=45 LITERS OF 60% ALCOHOL IS NEEDED.
PROOF:
.6*45+.9*90=.8(90+45)
27+81=.8(135)
108=108