PSLE Tommy, Brandon and Fred had 360 stickers altogether. Tommy gave
320 of his stickers to Brandon and
14 of his stickers to Fred. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Brandon and Fred at first?
|
Tommy |
Brandon |
Fred |
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 Tommy, Brandon and Fred in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Tommy had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 360
1 u = 360 ÷ 36 = 10
Difference in the number of stickers between Brandon and Fred at first
= 9 u - 7 u
= 2 u
= 2 x 10
= 20
Answer(s): 20