A chemist must prepare 350ml of a chemical solution made up of two parts alcohol and three parts acid. How much of each should be used?
This is the solution to simple "Applications Of Equations".
Now the solution: Let n be the number of milliliters in each part. The picture above shows the solution. From the diagram, we have
2n+3n = 350
5n = 350
n = 350/5 = 70
But n = 70 is not the answer to the original problem. Each part has 70 ml.
The amount of alcohol is 2n = 2(70) = 140, and the amount of acid is 3n = 3(70) = 210.
Thus, the chemist should use 140ml of alcohol and 210ml of acid are the answers to this simple equation problem using two variables.
More Info:
www.boundless.com