Erika read
15 of the manual. If she had read another 60 pages, she would have read
710 of the whole manual altogether. How many pages were there in the manual?
| |
Read |
Not read |
Total |
| Before |
1x2 =
2 u |
4x2 =
8 u |
5x2 =
10 u |
| Change |
+ 60 |
- 60 |
|
| After |
7x1 =
7 u |
3x1 =
3 u |
10x1 =
10 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 5 and 10 is 10.
Number of additional pages that Erika would have read
= 7 u - 2 u
= 5 u
5 u = 60
1 u = 60 ÷ 5 = 12
Number of pages in the manual
= 10 u
= 10 x 12
= 120
Answer(s): 120
