Free points cs ya & brainlist

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

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.

What’s the range cuz i can’t find it?