We know that the number of 2-page entries added to the number of 1-page entries must come to 10.
So we can make a table of all the ways to do this:
Number of 2-page entries |
Number of 1-page entries |
0 |
10 |
1 (2 pages) |
8 |
2 (4 pages) |
6 |
3 (6 pages) |
4 |
4 (8 pages) |
2 |
5 (10 pages) |
0 |
From the table we can see that there are 6 ways to do this because there are 6 rows in the table. In each row the total of pages comes to 10.