A chemist has 200 liters of a solution which is 12% acid. She has another solution which is 30% acid. She needs a new solution which is 20% acid. The chemist used the chart to organize the amounts of solutions she plans to mix. How many liters of 30% acid solution, x, does the chemist need to add to the 12% acid solution to obtain a 20% acid solution? Total Amount Acid Content (liters) (liters) 12% Acid 200 0.12(200) Solution 30% Acid Solution 0.3x New Mixture 200 + X 0.2(200 + X) CLEAR SUBMIT 360 240 liters 200 liters 160 liters

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Rate of Change

The relation between two quantities which displays how much greater one quantity is than another is called ratio.

Slope

The change in the vertical distances is known as the rise and the change in the horizontal distances is known as the run. So, the rise divided by run is nothing but a slope value. It is calculated with simple algebraic equations as: