PSLE Ian, Carl and Ken had 150 stickers altogether. Ian gave
110 of his stickers to Carl and
25 of his stickers to Ken. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Carl and Ken at first?
|
Ian |
Carl |
Ken |
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, Carl and Ken 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 Carl and Ken at first
= 4 u - 1 u
= 3 u
= 3 x 10
= 30
Answer(s): 30