The aquarium had a large tank of small fish to feed the seals. On Thursday, the seals ate 138 of the fish. On Friday, the seals ate 456 of the fish. Then, 221 fish
were left in the tank. How many fish were in the tank at first?

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