PSLE Ethan, Mark and Charlie had 288 stickers altogether. Ethan gave
320 of his stickers to Mark and
14 of his stickers to Charlie. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Mark and Charlie at first?
|
Ethan |
Mark |
Charlie |
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, Mark and Charlie 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 = 288
1 u = 288 ÷ 36 = 8
Difference in the number of stickers between Mark and Charlie at first
= 9 u - 7 u
= 2 u
= 2 x 8
= 16
Answer(s): 16