Risa read
27 of the book. If she had read another 348 pages, she would have read
710 of the whole book altogether. How many pages were there in the book?
|
Read |
Not read |
Total |
Before |
2x10 = 20 u |
5x10 = 50 u |
7x10 = 70 u |
Change |
+ 348 |
- 348 |
|
After |
7x7 = 49 u |
3x7 = 21 u |
10x7 = 70 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 7 and 10 is 70.
Number of additional pages that Risa would have read
= 49 u - 20 u
= 29 u
29 u = 348
1 u = 348 ÷ 29 = 12
Number of pages in the book
= 70 u
= 70 x 12
= 840
Answer(s): 840