If 1 cup of water is added to a 5-cup mixture that is 2/3 salt

If 1 cup of water is added to a 5-cup mixture that is \(\frac23\) salt and \(\frac13\) water, what percent of the 6-cup mixture is salt? a. 20% b. 25% c. 33.33% d. 55.56% e. 66.67%