Carl had
25 the number of erasers that Liam had at first. After Liam gave Carl 66 of his erasers, Carl had
47 the number of erasers that Liam had. How many erasers did Carl have at first?
|
Carl |
Liam |
Total |
Before |
2x11 = 22 u |
5x11 = 55 u |
7x11 = 77 u |
Change |
+ 6 u |
- 6 u |
|
After |
4x7 = 28 u |
7x7 = 49 u |
11x7 = 77 u |
The total number of erasers that Carl and Liam had at first and in the end remains unchanged. Make the total number of erasers the same. LCM of 7 and 11 is 77.
Number of erasers that Liam gave Carl
= 28 u - 22 u
= 6 u
6 u = 66
1 u = 66 ÷ 6 = 11
Number of erasers that Carl had at first
= 22 u
= 22 x 11
= 242
Answer(s): 242