Question 115234
.4*12+1X=.6(12+X)
4.8+X=7.2+.6X
X-.6X=7.2-4.8
.4X=2.4
X=2.4/.4
X=6 LITERS OF PURE ANTIFREEZE MUST BE ADDED.
PROOF
.4*12+6=.6(12+6)
4.8+6=.6*18
10.8=10.8