Gabby was attempting to read a book within a week. On Monday, she had read
14 of the book. By Friday, she had read another 91 pages and the ratio of the number of pages read to the total number of pages was 9 : 10. Find the average number of pages Gabby should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
1x5 = 5 u |
3x5 = 15 u |
4x5 = 20 u |
Change |
+ 91 |
- 91 |
|
Friday |
9x2 = 18 u |
1x2 = 2 u |
10x2 = 20 u |
Number of pages that Gabby read
= 18 u - 5 u
= 13 u
13 u = 91
1 u = 91 ÷ 13 = 7
Total number of pages
= 20 u
= 20 x 7
= 140
Average number of pages to read per day
= 140 ÷ 7
= 20
Answer(s): 20