Irene was attempting to read a book within a week. On Monday, she had read
37 of the book. By Friday, she had read another 369 pages and the ratio of the number of pages read to the total number of pages was 11 : 12. Find the average number of pages Irene should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
3x12 = 36 u |
4x12 = 48 u |
7x12 = 84 u |
Change |
+ 369 |
- 369 |
|
Friday |
11x7 = 77 u |
1x7 = 7 u |
12x7 = 84 u |
Number of pages that Irene read
= 77 u - 36 u
= 41 u
41 u = 369
1 u = 369 ÷ 41 = 9
Total number of pages
= 84 u
= 84 x 9
= 756
Average number of pages to read per day
= 756 ÷ 7
= 108
Answer(s): 108