Question 89411
.40X+(20-X)=.5*20
.4X+20-X=10
-.6X=10-20
-.6X=-10
X=-10/-.6
X=16.67 GALLONS OF 40% ANTIFREEZE IS REQUIRED.
THUS WE'LL NEED 3.33 GALLONS OF 100% ANTIFREEZE.
16.67*.4+3.33=10
6.67+3.33=10
10=10