PSLE Bobby, Peter and Archie had 396 stickers altogether. Bobby gave
320 of his stickers to Peter and
14 of his stickers to Archie. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Peter and Archie at first?
|
Bobby |
Peter |
Archie |
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 Bobby, Peter and Archie in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Bobby had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 396
1 u = 396 ÷ 36 = 11
Difference in the number of stickers between Peter and Archie at first
= 9 u - 7 u
= 2 u
= 2 x 11
= 22
Answer(s): 22