SOLUTION: Gary has a collection of comic books. After selling 70% of his comic books, he has 42 comic books left. How many comic books did he start with?

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Question 940958: Gary has a collection of comic books. After selling 70% of his comic books, he has 42 comic books left. How many comic books did he start with?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
So 42 books are the remaining 30%.
42%2FX=30%2F100
X=4200%2F30
X=140