EXPLANATION
Let's see the facts:
- (1/4) solution / gal water
-He uses: 12 1/3 gallon of water
In order to find the amount of solution he needs to make the water safe we must apply the unitary method as shown as follows:
[tex]\text{Amount solution=}\frac{\frac{1}{4}\text{solution}}{\text{gal water}}\cdot12\frac{1}{3}\text{gal water=}\frac{37}{12}=3\frac{1}{12}\text{cups of solution}[/tex]He should use 3 1/12 cups of solution to make the water safe
