PSLE David, Charlie and Reggie had 90 stickers altogether. David gave
110 of his stickers to Charlie and
25 of his stickers to Reggie. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Charlie and Reggie at first?
|
David |
Charlie |
Reggie |
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 David, Charlie and Reggie in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that David had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Difference in the number of stickers between Charlie and Reggie at first
= 4 u - 1 u
= 3 u
= 3 x 6
= 18
Answer(s): 18