PSLE Oscar, Sam and Justin had 324 stickers altogether. Oscar gave
320 of his stickers to Sam and
25 of his stickers to Justin. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Sam and Justin at first?
|
Oscar |
Sam |
Justin |
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 Oscar, Sam and Justin in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Oscar had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 324
1 u = 324 ÷ 27 = 12
Difference in the number of stickers between Sam and Justin at first
= 6 u - 1 u
= 5 u
= 5 x 12
= 60
Answer(s): 60