PSLE Mark, Eric and Lee had 252 stickers altogether. Mark gave
320 of his stickers to Eric and
14 of his stickers to Lee. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Eric and Lee at first?
|
Mark |
Eric |
Lee |
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 Mark, Eric and Lee in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Mark had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 252
1 u = 252 ÷ 36 = 7
Difference in the number of stickers between Eric and Lee at first
= 9 u - 7 u
= 2 u
= 2 x 7
= 14
Answer(s): 14