SOLUTION: Can you please help me with the following? How many gallons of a 30% alcohol solution must be mixed with 70 gallons of a 19% solution to obtain a solution that is 20% alcolhol?

Algebra ->  Functions -> SOLUTION: Can you please help me with the following? How many gallons of a 30% alcohol solution must be mixed with 70 gallons of a 19% solution to obtain a solution that is 20% alcolhol?       Log On


   

Question 388132: Can you please help me with the following?
How many gallons of a 30% alcohol solution must be mixed with 70 gallons of a 19% solution to obtain a solution that is 20% alcolhol?
Thank you
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
70*0.19 + x*0.30 = (70 + x)*0.20;
13.3 + 0.30x = 14 + 0.20x;
-0.70 = -0.1x;
x = 7 gallons, the amount of 30% alcohol solution that must be added.