First of all, reading 30 pages a day is equivalent to this formula: 30 pages/day.

After reading for four days in a row, it is 30 pages/day x 4 days = 120 pages (pay attention to the operation of the unit, and the number of days will be excluded).

Then, on the fifth day, start reading from the page120+1=121. Think about it. If you read the first page of the book, you won't read the first few pages next time, just start reading from the second page, in other words, add 65438+.

So the final answer is to start with 12 1 page!