Let P be the number of pages in the first chapter.

The second chapter has P + 3 pages.

The third chapter has P + 3 + 3 = P + <<+3+3=6>>6 pages.

The fourth chapter has P + 6 + 3 = P + <<+6+3=9>>9 pages.

The fifth chapter has P + 9 + 3 = P + <<+9+3=12>>12 pages.

The whole book has P + 3 + P + 6 + P + 9 + P + 12 = 5P + 30 = 95 pages.

Thus, without the 30 extra pages from additional chapters, 5P = 95 - 30 = 65 pages.

Therefore, the first chapter had P = 65 / 5 = <<65/5=13>>13 pages.

# Answer

13
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Rita is reading a five-chapter book with 95 pages. Each chapter has three pages more than the previous one. How many pages does the first chapter have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13
Rita is reading a five-chapter book with 95 pages. Each chapter has three pages more than the previous one. How many pages does the first chapter have?
train