Calculate the sum and enter it, as a fraction in lowest terms, using the slash (/) for the fraction bar. 4/15 + 7/9

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same