Question 519475: How many quarts of water must be added to 15 qt of an 80% antifreeze solution to make a 75% antifreeze solution?
thanks!!! Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! --------percent ---------------- quantity
Antifreeze I 80 ---------------- 15 quarts
water 0 ---------------- x quarts
Mixture 75 ---------------- 15 + x quarts
80*15+0 x= 75(15+x )
1200+0 x=1125 + 75 x
-75 x = 1125 - -1200
-75 x = -75
/ -75
x = 1
1 quart of water
