PSLE Bobby, Ivan and Oliver had 90 stickers altogether. Bobby gave
110 of his stickers to Ivan 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 Ivan and Oliver at first?
|
Bobby |
Ivan |
Oliver |
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 Bobby, Ivan and Oliver in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Bobby had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Difference in the number of stickers between Ivan and Oliver at first
= 4 u - 1 u
= 3 u
= 3 x 6
= 18
Answer(s): 18