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

# Answer

150
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
150
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?
train