Jaxson has a coin collection. He keeps 7 of the coins in his box, which is 10% of the collection. How many total coins are in his collection? Multiply/scale up to solve.

Firstly, you should find 10% of 9, which is 0.9 You've then got to multiply this by 5.5, as you've got 55 books. 0.9x5.5= 4.95 Therefore, as you cannot have .95 of a books, this has to be rounded to 5. Therefore, the library has 5 books out on the topic. Hope this helps :)