Question 715759
.80X+.25*80=.70(80+X)
.80X+20=56+.70X
.80X-.70X=56-20
.10X=36
X=36/.10
X=360 GALLONS OF 80% ANTIFREEZE IS USED.
PROOF:
.80*360+.25*80=.70(80+360)
288+20=.70*440
308=308