Cathy read
12 of the story book. If she had read another 30 pages, she would have read
710 of the whole story book altogether. How many pages were there in the story book?
| |
Read |
Not read |
Total |
| Before |
1x5 =
5 u |
1x5 =
5 u |
2x5 =
10 u |
| Change |
+ 30 |
- 30 |
|
| 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 2 and 10 is 10.
Number of additional pages that Cathy would have read
= 7 u - 5 u
= 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
Number of pages in the story book
= 10 u
= 10 x 15
= 150
Answer(s): 150
