Xiaogang finished a book in 4 days, with an average of 30 pages per day. He read more than 30 pages every day in the first 3 days. Estimate the number of pages he read on the fourth day. How many pages did he read on the fourth day?
小刚4天看完一本书，平均每天看30页．他前3天每天看的页数都超过30页，估计一下第四天看的页数第四天看的比多少页少
<result>30</result>