Answer
a. $C=\frac{x+0.35(200)}{x+200}=\frac{x+70}{x+200}$
b. $300$ liters
Work Step by Step
a. Using the formula given in the previous problem, we have $C=\frac{x+0.35(200)}{x+200}=\frac{x+70}{x+200}$
b. Let $C=74(\%)$; we have $\frac{x+70}{x+200}=0.74$ or $x+70=0.74x+148$ and $0.26x=78$, or $x=300$ liters
