PSLE Howard, Billy and Fred had 180 stickers altogether. Howard gave
110 of his stickers to Billy and
25 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 Billy and Fred at first?
|
Howard |
Billy |
Fred |
Total |
Before |
10 u |
4 u |
1 u |
15 u |
Change 1 |
- 1 u |
+ 1 u |
|
|
Change 2 |
- 4 u |
|
+ 4 u |
|
After |
5 u |
5 u |
5 u |
15 u |
Comparing between Howard, Billy and Fred in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Howard had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 180
1 u = 180 ÷ 15 = 12
Difference in the number of stickers between Billy and Fred at first
= 4 u - 1 u
= 3 u
= 3 x 12
= 36
Answer(s): 36