PSLE Ian, Sam and Oliver had 243 stickers altogether. Ian gave
320 of his stickers to Sam and
25 of his stickers to Oliver. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Sam and Oliver at first?
|
Ian |
Sam |
Oliver |
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 Ian, Sam and Oliver in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Ian had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 243
1 u = 243 ÷ 27 = 9
Difference in the number of stickers between Sam and Oliver at first
= 6 u - 1 u
= 5 u
= 5 x 9
= 45
Answer(s): 45