Difference in the 2 in 92.5 and the 4 in 8.49

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Given abcd ac=38 and ae=3x+4 find the value of x

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?