Shiyun was attempting to read a book within a week. On Monday, she had read
25 of the book. By Friday, she had read another 133 pages and the ratio of the number of pages read to the total number of pages was 7 : 8. Find the average number of pages Shiyun should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
2x8 = 16 u |
3x8 = 24 u |
5x8 = 40 u |
Change |
+ 133 |
- 133 |
|
Friday |
7x5 = 35 u |
1x5 = 5 u |
8x5 = 40 u |
Number of pages that Shiyun read
= 35 u - 16 u
= 19 u
19 u = 133
1 u = 133 ÷ 19 = 7
Total number of pages
= 40 u
= 40 x 7
= 280
Average number of pages to read per day
= 280 ÷ 7
= 40
Answer(s): 40