I need help with this math problem

The solution set for 5v2 – 125 = 0 is

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

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers