Question

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

Answer 1

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.