SOLUTION: How many gallons of a 90
​%
antifreeze solution must be mixed with 100
gallons of 25
​%
antifreeze to get a mixture that is 80
​%
​antifreeze?
Algebra.Com
Question 1047973: How many gallons of a 90
%
antifreeze solution must be mixed with 100
gallons of 25
%
antifreeze to get a mixture that is 80
%
antifreeze? Use the six-step method.
Found 2 solutions by josgarithmetic, addingup:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
What six-step method?
v, how much antifreeze 90% to add
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Let x be the amount of 90% solution:
0.90x+0.25(100) = 0.80(100+x)
0.90x+25 = 80+0.80x
0.10x = 55
x = 550 gallon
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