Original ratio is 6:5 which means it will only stay the same if the amount of movies to band is taken at multiples of this ratio. per sample if 24 movies are sold then
24/6=4 so you will have to multiply or sell 5*4=20 of the band ones to be able to keep same ratio.
250- 125 is 125 so the worker earns 125 over a time span of 10 hours so we need to divide 125 by 9 which then we get 15.625 . Correct me if I'm wrong it says this is a Highschool leveled question and I'm not in Highschool.