PSLE David, Sean and Daniel had 300 stickers altogether. David gave
110 of his stickers to Sean and
25 of his stickers to Daniel. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Sean and Daniel at first?
|
David |
Sean |
Daniel |
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 David, Sean and Daniel in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that David had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 300
1 u = 300 ÷ 15 = 20
Difference in the number of stickers between Sean and Daniel at first
= 4 u - 1 u
= 3 u
= 3 x 20
= 60
Answer(s): 60