Jackson mom limits the amout of time he is allowed to play video games . after jackson play for 9 .inutes , his mom tells him that he has used up 30% of his time . how many more minutes can jackson play before he uses all of his time

If we know that 30% of the time is used after 9 minutes we can write this mathematically as:


By solving for x we can determine the total time allowed to play games and so:


The total time allowed to play games is 30 minutes. Since 9 minutes have lapsed 30-9=21 minutes left to play.