Half of the pages are images, which means 98 * 0.5 = <<98*0.5=49>>49 pages.
So there are 98 - 49 - 11 pages for the introduction = <<98-49-11=38>>38 remaining pages.
Half of the remaining pages are filled with text, which means 38 * 0.5 = <<38*0.5=19>>19 pages.
#### 19