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