Risa read
13 of the manual. If she had read another 8 pages, she would have read
49 of the whole manual altogether. How many pages were there in the manual?
|
Read |
Not read |
Total |
Before |
1x3 = 3 u |
2x3 = 6 u |
3x3 = 9 u |
Change |
+ 8 |
- 8 |
|
After |
4x1 = 4 u |
5x1 = 5 u |
9x1 = 9 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 3 and 9 is 9.
Number of additional pages that Risa would have read
= 4 u - 3 u
= 1 u
1 u = 8
1 u = 8 ÷ 1 = 8
Number of pages in the manual
= 9 u
= 9 x 8
= 72
Answer(s): 72