SOLUTION: How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 20% antifreeze to get a mix that is 60% antifreeze? I tried doing .70(x)+.20(x+70)=.6 and came up wi
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Question 714697: How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 20% antifreeze to get a mix that is 60% antifreeze? I tried doing .70(x)+.20(x+70)=.6 and came up with a negative answer of -14.88. Please help Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! -------------- percent ---------------- Amount
Amtifreeze I 20 ---------------- 70 gal
Antifreeze II 70 ---------------- x gal
Mixture 60 ---------------- 70 + x gal
20 * 70 + 70 x = 60 ( 70 + x )
1400 + 70 x = 4200 + 60 x
70 x -60 x = -1400 + 4200
10 x = 2800
/ 10
x = 280 gal Antifreeze II
