Answer:
Jason has 16 books
Bill has 6 books
Step-by-step explanation: you take bill (b) add it to 2 times bill so (b+2b) which gets you three b. Then you take that 3b, but first you have to minus four from both sides; so now you have 3b=18. Then divide by three on both sides and you get six as bills number of books. Then add ten and that will give you Jason’s number of books