The cost of instruments used in a reconstruction job is $65.70. this is a reduction from its original cost of $82.13. what is the percent decrease in the cost of instruments to the nearest percent?

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?