Austin is a songwriter who collects royalties on his songs whenever they are played in a commercial or a movie. Austin will earn
$50 every time one of his songs is played in a commercial and he will earn $110 every time one of his songs is played in a movie. Austin earned a total of $780 in royalties on 12 commercials and movies. Determine the number of commercials and the number of movies on which Austin's songs were played
1 movies is equal to $110 so 3 movies will give Austin $330 meaning we only need $450 remaining to make the given amount so 15 commercials will make $450. So in total the 3 movie ($330) plus the 15 commercials ($450) will make the given amount ($780) meaning his songs where played in 3 movies and 15 commercials.
