Question 15
Randy and Sandy both have a total of 20 books. After Sandy loses three by leaving them on the bus, and some birthday gifts double Randy's collection, their total increases to 30 books. How many books did each have before these changes?
**Editorial input format:** Enter the original counts in Randy, Sandy order, separated by a comma.
**Editorial input note:** Use no spaces before or after commas.
**Editorial input format:** Enter the original counts in Randy, Sandy order, separated by a comma.
**Editorial input note:** Use no spaces before or after commas.