The answer i can’t do it i don’t understand it

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

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?

Can you me find the missing length. i attached an image.