PSLE Archie, Andy and David had 300 stickers altogether. Archie gave
110 of his stickers to Andy 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 Andy and David at first?
|
Archie |
Andy |
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 Archie, Andy and David in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Archie 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 Andy and David at first
= 4 u - 1 u
= 3 u
= 3 x 20
= 60
Answer(s): 60