Barbara was attempting to read a book within a week. On Monday, she had read
27 of the book. By Friday, she had read another 492 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 Barbara 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 |
+ 492 |
- 492 |
|
Friday |
9x7 = 63 u |
2x7 = 14 u |
11x7 = 77 u |
Number of pages that Barbara read
= 63 u - 22 u
= 41 u
41 u = 492
1 u = 492 ÷ 41 = 12
Total number of pages
= 77 u
= 77 x 12
= 924
Average number of pages to read per day
= 924 ÷ 7
= 132
Answer(s): 132