Texas instruments ti-84 plus graphing calculator, 10-digit lcd

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

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?

Me. i can't figure out this question. give an explanation too. .