It is predicted that by 2050, there will be 1010 people living on Earth. At that time, it is predicted there will be approximately 1012 trees. How many trees will there be for each person?

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