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