Michelle and Lucinda share a large pizza Michelle a 0.25 of the pizza while listen to a 3/5 of the pizza what portion of the pizza did Michelle and Lucinda eat all together

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning