Joelle read
18 of the book. If she had read another 620 pages, she would have read
59 of the whole book altogether. How many pages were there in the book?
|
Read |
Not read |
Total |
Before |
1x9 = 9 u |
7x9 = 63 u |
8x9 = 72 u |
Change |
+ 620 |
- 620 |
|
After |
5x8 = 40 u |
4x8 = 32 u |
9x8 = 72 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 8 and 9 is 72.
Number of additional pages that Joelle would have read
= 40 u - 9 u
= 31 u
31 u = 620
1 u = 620 ÷ 31 = 20
Number of pages in the book
= 72 u
= 72 x 20
= 1440
Answer(s): 1440