PSLE Ethan, Bobby and Peter had 360 stickers altogether. Ethan gave
320 of his stickers to Bobby and
14 of his stickers to Peter. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Bobby and Peter at first?
|
Ethan |
Bobby |
Peter |
Total |
Before |
20 u |
9 u |
7 u |
36 u |
Change 1 |
- 3 u |
+ 3 u |
|
|
Change 2 |
- 5 u |
|
+ 5 u |
|
After |
12 u |
12 u |
12 u |
36 u |
Comparing between Ethan, Bobby and Peter in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Ethan had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 360
1 u = 360 ÷ 36 = 10
Difference in the number of stickers between Bobby and Peter at first
= 9 u - 7 u
= 2 u
= 2 x 10
= 20
Answer(s): 20