a movie store had 309 movies they were putting on sixteen selves. if the owner wanted to make sure each shelf had the same amount without any extra, how many more movies whould he need?
+37097
309 mod 16 = 5 so 11 more movies would be required for a total of 320 movies( so there will be no remainders after division by 16 shelves (20 movies per shelf) )
