Anna was attempting to read a book within a week. On Monday, she had read
27 of the book. By Friday, she had read another 451 pages and the ratio of the number of pages read to the total number of pages was 9 : 11. Find the average number of pages Anna should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
2x11 = 22 u |
5x11 = 55 u |
7x11 = 77 u |
Change |
+ 451 |
- 451 |
|
Friday |
9x7 = 63 u |
2x7 = 14 u |
11x7 = 77 u |
Number of pages that Anna read
= 63 u - 22 u
= 41 u
41 u = 451
1 u = 451 ÷ 41 = 11
Total number of pages
= 77 u
= 77 x 11
= 847
Average number of pages to read per day
= 847 ÷ 7
= 121
Answer(s): 121