PSLE Seth, Ethan and Elijah had 180 stickers altogether. Seth gave
110 of his stickers to Ethan and
25 of his stickers to Elijah. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Ethan and Elijah at first?
|
Seth |
Ethan |
Elijah |
Total |
Before |
10 u |
4 u |
1 u |
15 u |
Change 1 |
- 1 u |
+ 1 u |
|
|
Change 2 |
- 4 u |
|
+ 4 u |
|
After |
5 u |
5 u |
5 u |
15 u |
Comparing between Seth, Ethan and Elijah in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Seth had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 180
1 u = 180 ÷ 15 = 12
Difference in the number of stickers between Ethan and Elijah at first
= 4 u - 1 u
= 3 u
= 3 x 12
= 36
Answer(s): 36