PSLE Ian, Pierre and David had 150 stickers altogether. Ian gave
110 of his stickers to Pierre and
25 of his stickers to David. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Pierre and David at first?
|
Ian |
Pierre |
David |
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 Ian, Pierre and David in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Ian had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 150
1 u = 150 ÷ 15 = 10
Difference in the number of stickers between Pierre and David at first
= 4 u - 1 u
= 3 u
= 3 x 10
= 30
Answer(s): 30