Ivan had
38 the number of erasers that Japheth had at first. After Japheth gave Ivan 21 of his erasers, Ivan had
37 the number of erasers that Japheth had. How many erasers did Japheth have in the end?
|
Ivan |
Japheth |
Total |
Before |
3x10 = 30 u |
8x10 = 80 u |
11x10 = 110 u |
Change |
+ 3 u |
- 3 u |
|
After |
3x11 = 33 u |
7x11 = 77 u |
10x11 = 110 u |
The total number of erasers that Ivan and Japheth had at first and in the end remains unchanged. Make the total number of erasers the same. LCM of 11 and 10 is 110.
Number of erasers that Japheth gave Ivan
= 33 u - 30 u
= 3 u
3 u = 21
1 u = 21 ÷ 3 = 7
Number of erasers that Japheth had in the end
= 77 u
= 77 x 7
= 539
Answer(s): 539