What fractions does 40% represent?

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

How is this equation completed? i cannot find any examples in the book.

What is the perimeter of an equilateral triangle if each side is (x+3)?