SOLUTION: How many gallons of a 90​% antifreeze solution must be mixed with 70 gallons of 10​% antifreeze to get a mixture that is 80​% ​antifreeze? Use the​ si

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Question 1087050: How many gallons of a 90​% antifreeze solution must be mixed with 70 gallons of 10​% antifreeze to get a mixture that is 80​% ​antifreeze? Use the​ six-step method.
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
v, gallons of the 90% antifreeze

Keeping strictly as percents,

Numerator represents pure antifreeze.
Denominator represents amount of mixture.
Right-side number is the target percent wanted.

Solve for v.



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v=490

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