Question

Jonathan has a comic book collection.

He tells you he sold half of them, but then bought 9 more new comics.
After this, Jonathan now has 81 comic books. How many comic books did he have before he sold some? a) Let b = the number of Jonathan had before selling some. Write the equation you would use to solve this problem.

Answer 1

144.
Ok so he bought 9, and now has 81. All we have to do is take 9 away from 81 again and then multiply it by 2.