How would i do this Divide. 3+5/2

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5