After losing one of the pages you have 12 - 1 = <<12-1=11>>11 pages of stickers.

If each page has 20 stickers on it, you have 11 x 20 = <<11*20=220>>220 stickers.

# Answer

220
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are 20 stickers on a page. If you have 12 pages of stickers but lose one of the pages, then how many stickers would you have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
220
There are 20 stickers on a page. If you have 12 pages of stickers but lose one of the pages, then how many stickers would you have?
train