Number of pages in x = 120 pages
Number of pages in y = 10%, more =
120+120× = 132 pages
Number of pages in z = 10% less =
120−120× = 108 pages
Total pages in x, y, and z = 132 + 120 + 108 = 360 pages
Number of pages torn from = 5% of 120
=5× = 6 pages
Number of pages torn form y = 10% of 132
=×132 = 13.2 pages
Number of pages torn out by z is 15% of 108
=×108=16.2 pages
Total number of pages torn out from x, y and z = 6 + 13.2 + 16.2 = 35.4 pages
Per cent of total pages torn out
=×100=9.83%