PSLE Eric, Lee and Sam had 105 stickers altogether. Eric gave
110 of his stickers to Lee and
25 of his stickers to Sam. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Lee and Sam at first?
|
Eric |
Lee |
Sam |
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 Eric, Lee and Sam in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Eric had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 105
1 u = 105 ÷ 15 = 7
Difference in the number of stickers between Lee and Sam at first
= 4 u - 1 u
= 3 u
= 3 x 7
= 21
Answer(s): 21