Diana read
17 of the story book. If she had read another 615 pages, she would have read
78 of the whole story book altogether. How many pages were there in the story book?
|
Read |
Not read |
Total |
Before |
1x8 = 8 u |
6x8 = 48 u |
7x8 = 56 u |
Change |
+ 615 |
- 615 |
|
After |
7x7 = 49 u |
1x7 = 7 u |
8x7 = 56 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 7 and 8 is 56.
Number of additional pages that Diana would have read
= 49 u - 8 u
= 41 u
41 u = 615
1 u = 615 ÷ 41 = 15
Number of pages in the story book
= 56 u
= 56 x 15
= 840
Answer(s): 840