Tina was attempting to read a book within a week. On Monday, she had read
25 of the book. By Friday, she had read another 217 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 Tina should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
2x12 = 24 u |
3x12 = 36 u |
5x12 = 60 u |
Change |
+ 217 |
- 217 |
|
Friday |
11x5 = 55 u |
1x5 = 5 u |
12x5 = 60 u |
Number of pages that Tina read
= 55 u - 24 u
= 31 u
31 u = 217
1 u = 217 ÷ 31 = 7
Total number of pages
= 60 u
= 60 x 7
= 420
Average number of pages to read per day
= 420 ÷ 7
= 60
Answer(s): 60