Deshaun read 19,200 pages because 60 x 320 = <<60*320=19200>>19,200
The person closest to him read 14, 400 pages because 19,200 x .75 = <<14400=14400>>14,400
They read 180 pages a day because 14, 400 / 80 = <<14400/80=180>>180
#### 180