in triangle DEF and triangle PQR where DE is 2cm ,EF is 3cm, angle DEF is 60 and PQ is 6cm ,QR is 9cm, and angle PQR is 60 show that these are similar triangle with the appropriate criteria

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?