Each year, the Department of Water Works measures the chloride concentration level in the water. The first year, they found the
chloride concentration changed by −1 and 3/5 mg/L . It is estimated that the chloride concentration will change −2 and 1/15 mg/L the next year. What is the total change that will likely occur in 2 years?
Enter your answer as a simplified mixed number in the box.
