PSLE Ethan, Billy and Carl had 120 stickers altogether. Ethan gave
110 of his stickers to Billy and
25 of his stickers to Carl. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Billy and Carl at first?
|
Ethan |
Billy |
Carl |
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 Ethan, Billy and Carl in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Ethan had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 120
1 u = 120 ÷ 15 = 8
Difference in the number of stickers between Billy and Carl at first
= 4 u - 1 u
= 3 u
= 3 x 8
= 24
Answer(s): 24