James prints out 2 books.  They are each 600 pages long.  He prints out double-sided and 4 pages per side.  How many sheets of paper does he use?
He printed 600*2=<<600*2=1200>>1200 pages
Each sheet of paper was 4*2=<<4*2=8>>8 pages
So he used 1200/8=<<1200/8=150>>150 sheets of paper
#### 150