One eidtion of alices adventures in wonderland has 352 pages. how many 4's were used in the page numbers?

In the first 100 pages there are 10 pages with numbers 40-49 (that is total of 11 4's) and another 4 in the units, 10's, 20's, ... 90's (not including 40's) That is total of 9 4's.

So in first 100 pages there are 20 4's.

therefore there are 20 4's on pages 101-200 and another 20 4's on pages 201-300.

On pages 301 to 352 there are 15 4's.

answer is 3*20 + 15 = 75.