Joelle read
12 of the encyclopedia. If she had read another 80 pages, she would have read
79 of the whole encyclopedia altogether. How many pages were there in the encyclopedia?
|
Read |
Not read |
Total |
Before |
1x9 = 9 u |
1x9 = 9 u |
2x9 = 18 u |
Change |
+ 80 |
- 80 |
|
After |
7x2 = 14 u |
2x2 = 4 u |
9x2 = 18 u |
The total number of pages remains unchanged. Make the total number of pages the same. LCM of 2 and 9 is 18.
Number of additional pages that Joelle would have read
= 14 u - 9 u
= 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Number of pages in the encyclopedia
= 18 u
= 18 x 16
= 288
Answer(s): 288