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