PSLE Owen, Mark and Harry had 324 stickers altogether. Owen gave
320 of his stickers to Mark and
14 of his stickers to Harry. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Mark and Harry at first?
|
Owen |
Mark |
Harry |
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 Owen, Mark and Harry in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Owen had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 324
1 u = 324 ÷ 36 = 9
Difference in the number of stickers between Mark and Harry at first
= 9 u - 7 u
= 2 u
= 2 x 9
= 18
Answer(s): 18