What fraction of an hour is 15 minutes pls help

Can somebody me out with this question

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.