PSLE Ivan, Sam and Tom had 540 stickers altogether. Ivan gave
320 of his stickers to Sam and
25 of his stickers to Tom. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Sam and Tom at first?
|
Ivan |
Sam |
Tom |
Total |
Before |
20 u |
6 u |
1 u |
27 u |
Change 1 |
- 3 u |
+ 3 u |
|
|
Change 2 |
- 8 u |
|
+ 8 u |
|
After |
9 u |
9 u |
9 u |
27 u |
Comparing between Ivan, Sam and Tom in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Ivan had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 540
1 u = 540 ÷ 27 = 20
Difference in the number of stickers between Sam and Tom at first
= 6 u - 1 u
= 5 u
= 5 x 20
= 100
Answer(s): 100