What number is between 0.3 and 7.5

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

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