PSLE Pierre, Oliver and Ahmad had 405 stickers altogether. Pierre gave
320 of his stickers to Oliver and
25 of his stickers to Ahmad. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Oliver and Ahmad at first?
|
Pierre |
Oliver |
Ahmad |
Total |
Before |
20 u |
6 u |
1 u |
27 u |
Change 1 |
- 3 u |
+ 3 u |
|
|
Change 2 |
- 8 u |
|
+ 8 u |
|
After |
9 u |
9 u |
9 u |
27 u |
Comparing between Pierre, Oliver and Ahmad in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Pierre had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 405
1 u = 405 ÷ 27 = 15
Difference in the number of stickers between Oliver and Ahmad at first
= 6 u - 1 u
= 5 u
= 5 x 15
= 75
Answer(s): 75