Since Siena bookmarks 30 website pages from the research she does on her browser every day, at the end of March, with 31 days, she would have bookmarked 30*31 = <<30*31=930>>930 pages.

If Siena already has 400 bookmarked pages in her bookmarks library now, she will have 930+400 = <<400+930=1330>>1330 pages in her bookmarks library at the end of March.

# Answer

1330
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Every day in a week, Siena bookmarks 30 website pages from the research she does on her browser. If Siena has 400 bookmarked pages on her bookmarks library now, how many pages will she have in her bookmarks library at the end of March?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1330
Every day in a week, Siena bookmarks 30 website pages from the research she does on her browser. If Siena has 400 bookmarked pages on her bookmarks library now, how many pages will she have in her bookmarks library at the end of March?
train