The first night he read 20% of his 500-page book so he read .20*500 = <<20*.01*500=100>>100 pages

The book is 500 pages and he read 100 so that leaves 500-100 = <<500-100=400>>400 pages

The second night he reads 20% of the 500 pages so he read .20*500 = <<20*.01*500=100>>100 pages

The book is now 400 pages and he read 100 so that leaves 400-100 = <<400-100=300>>300 pages

The third night he read 30% of the book so he read .30*500 = <<30*.01*500=150>>150 pages

The book is now 300 pages and he read 150 pages so he has 300-150 =<<300-150=150>>150 pages left to read

# Answer

150
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Xander read 20% of his 500-page book in one hour.  The next night he read another 20% of the book.  On the third night, he read 30% of his book.  How many pages does he have left to read?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
150
Xander read 20% of his 500-page book in one hour.  The next night he read another 20% of the book.  On the third night, he read 30% of his book.  How many pages does he have left to read?
train