Question 306552
x+.20(50-x)=.40*50
x=10-.20x=20
.8x=20-10
.8x=10
x=10/.8
x=12.5 liters need to be drained & filled with 100% antifreeze.
Proof:
12.5+.20(50-12.5)=.40*50
12.5+.20*37.5=20
12.5+7.5=20
20=20