Five ninths times three fifths is one third.
5 over 55
Five times five is 25, therefore 25 as a fraction is 25/1. Any fraction over 1 is that number (three over one is three, sixty over sixty is sixty, etc.)
Yes, one-thirds equals five fifteenths.
There is no meaningful question in "three over five y plus one over nine". There cannot, therefore, be an answer.