PSLE Xavier, Ben and John had 648 stickers altogether. Xavier gave
320 of his stickers to Ben and
14 of his stickers to John. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Ben and John at first?
|
Xavier |
Ben |
John |
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 Xavier, Ben and John in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Xavier had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 648
1 u = 648 ÷ 36 = 18
Difference in the number of stickers between Ben and John at first
= 9 u - 7 u
= 2 u
= 2 x 18
= 36
Answer(s): 36