Xiao Ming planned to read a novel every few days. If he read 60 pages a day, he could finish it five days earlier. If he read 40 pages a day, he would have to finish it three days later.Xiao Ming plans to read a novel every few days. If he reads 60 pages a day, he can finish it five days earlier. If he reads 40 pages a day, he will finish it three days later.
Calculating how much faster reading 60 pages a day was than reading 40 pages a day:
Reading 60 pages a day is better than reading 40 pages a day, reading 40 pages per hour, 60 pages = 067 hours
Therefore, the total time Little Ming needed was:
1/067 = 1667(hours) 5 days ago
1667/067 = 28(hours) Days of delay
Therefore, Xiao Ming needed 28 hours to finish reading this novel, which was longer than expected.
Next, we can calculate the ratio of reading 60 pages a day to reading 40 pages a day, reading 40 pages per hour, reading 60 pages = 067 hours
's progress:
Reading 60 pages a day is better than reading 40 pages a day. Reading 60 pages per hour/40 pages = 15 hours
Therefore, the total time Little Ming needed was:
1 × 15 = 0667(hour) 5 days ago
0667/15 = 04(hours) Days of delay
Therefore, Xiaoming needed four hours to finish reading this novel, which was shorter than the estimated time.
To sum up, Xiaoming plans to read a novel every few days. If he reads 60 pages a day, he can finish it five days earlier. If he reads 40 pages a day, he will finish it three days later. If reading 60 pages a day was faster than reading 40 pages a day, reading 40 pages per hour, reading 60 pages per hour = 067 hours, the total time required was 1667 hours; if reading 60 pages a day was slower than reading 40 pages a day, reading 60 pages per hour, reading 60 pages per hour = 15 hours, the total time required was 0667 hours.
He had to read 12 pages a day, which would take him 15 days to finish. If he finished the book five days earlier, how many pages would he read every day?It would take 15 days to finish reading 12 pages a day. How many pages would you read if you finished the book five days in advance?
If the book has 100 pages and you read 12 pages a day, the number of days it takes to read the whole book is:
100 pages/12 pages/day = 866 days
Because the book needed 15 days to finish, it clearly needed 15-866=634 days.
In these 634 days, he had to read 12 pages a day to finish the book five days earlier.
Therefore, if you finish this book five days in advance, how many pages do you read every day:
12 pages/day x 634 days = 792 pages
Therefore, he had to read 792 pages a day to finish the book five days earlier.
Ding Ding read a book. On the first day, he would read 15 pages. After that, he would read five more pages every day than the previous day. After five days, he would finish reading. How many pages does this book have?Assuming that the book has x pages:
15 pages on the first day, so there are 15 pages in the book
From now on, I'll read five more pages every day than the day before, so after five days, I'll read (15+5)×5=125 pages, plus the 15 pages I've already read before, that's a total of 270 pages
Therefore, the book had a total of 270 pages.