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

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b