Please answer this correctly without making mistakes

Need on this one asap im almost done with this subject

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

If chord ab is congruent to chord cd, then what must be true about ef and eg?