PSLE Michael, Ethan and Eric had 90 stickers altogether. Michael gave
110 of his stickers to Ethan and
25 of his stickers to Eric. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Ethan and Eric at first?
|
Michael |
Ethan |
Eric |
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 Michael, Ethan and Eric in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Michael had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Difference in the number of stickers between Ethan and Eric at first
= 4 u - 1 u
= 3 u
= 3 x 6
= 18
Answer(s): 18