Kylie read
17 of the manual. If she had read another 20 pages, she would have read
57 of the whole manual altogether. How many pages were there in the manual?
| |
Read |
Not read |
Total |
| Before |
1x1 =
1 u |
6x1 =
6 u |
7x1 =
7 u |
| Change |
+ 20 |
- 20 |
|
| After |
5x1 =
5 u |
2x1 =
2 u |
7x1 =
7 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 7 and 7 is 7.
Number of additional pages that Kylie would have read
= 5 u - 1 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of pages in the manual
= 7 u
= 7 x 5
= 35
Answer(s): 35
