Justin had
38 the number of erasers that Fred had at first. After Fred gave Justin 108 of his erasers, Justin had
35 the number of erasers that Fred had. How many erasers did Fred have in the end?
|
Justin |
Fred |
Total |
Before |
3x8 = 24 u |
8x8 = 64 u |
11x8 = 88 u |
Change |
+ 9 u |
- 9 u |
|
After |
3x11 = 33 u |
5x11 = 55 u |
8x11 = 88 u |
The total number of erasers that Justin and Fred had at first and in the end remains unchanged. Make the total number of erasers the same. LCM of 11 and 8 is 88.
Number of erasers that Fred gave Justin
= 33 u - 24 u
= 9 u
9 u = 108
1 u = 108 ÷ 9 = 12
Number of erasers that Fred had in the end
= 55 u
= 55 x 12
= 660
Answer(s): 660