Question 792417: how many gallons of a 50% antifreeze solution must be mixed with 60 gallons of 25% antifreeze to get a mixture that is 40% antifreeze Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! --- percent ---------------- Quantity
Antifreeze type I 25 ---------------- 60 gallons
antifreeze type II 50 ---------------- x gallons
Mixture 40 ---------------- 60 + x gallons
25 * 60 + 50 x = 40 ( 60 + x )
1500 + 50 x = 2400 + 40 x
50 x -40 x = -1500 + 2400
10 x = 900
/ 10
x = 90 gallons antifreeze type II
