Min was attempting to read a book within a week. On Monday, she had read
37 of the book. By Friday, she had read another 38 pages and the ratio of the number of pages read to the total number of pages was 7 : 10. Find the average number of pages Min should have read each day to complete the book in a week.
|
Read |
Unread |
Total |
Monday |
3x10 = 30 u |
4x10 = 40 u |
7x10 = 70 u |
Change |
+ 38 |
- 38 |
|
Friday |
7x7 = 49 u |
3x7 = 21 u |
10x7 = 70 u |
Number of pages that Min read
= 49 u - 30 u
= 19 u
19 u = 38
1 u = 38 ÷ 19 = 2
Total number of pages
= 70 u
= 70 x 2
= 140
Average number of pages to read per day
= 140 ÷ 7
= 20
Answer(s): 20