A book has 3 chapters. The first chapter is 35 pages long the second chapter is 18 pages long and the third chapter is 3 pages long. How many more pages does the second chapter have than the third chapter?
First, we need to find how many pages are in the second chapter. 18 pages is the same as 18/1 pages, so we can say that the second chapter is 18/1 pages long. 

Next, we need to find how many pages are in the third chapter. 3 pages is the same as 3/1 pages, so we can say that the third chapter is 3/1 pages long. 

Now, we need to find the difference between the number of pages in the second chapter and the number of pages in the third chapter. The number of pages in the second chapter is 18/1 pages and the number of pages in the third chapter is 3/1 pages, so the difference is 15/1 pages. 

We can simplify 15/1 pages to just 15 pages, so we can say that the second chapter has 15 more pages than the third chapter.

Therefore the answer (numeric) is: 

15