Her geography textbook has 160 + 70 = <<160+70=230>>230 pages
The sum of pages of her history and geography textbook is 160 + 230 = <<160+230=390>>390 pages
Her math textbook has 390/2 = <<390/2=195>>195 pages
Her science textbook has 160 x 2 = <<160*2=320>>320 pages
In total, there would be 160 + 230 + 195 + 320 = <<160+230+195+320=905>>905 pages
#### 905