PSLE Japheth, Mark and Albert had 285 stickers altogether. Japheth gave
110 of his stickers to Mark and
25 of his stickers to Albert. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Mark and Albert at first?
|
Japheth |
Mark |
Albert |
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 Japheth, Mark and Albert in the end |
1x5 = 5 u |
1x5 = 5 u |
1x5 = 5 u |
3x5 = 15 u |
Fraction of stickers that Japheth had left
= 1 -
110 -
25 = 1 -
110 -
410 =
510 Total number of stickers
= 3 x 5 u
= 15 u
15 u = 285
1 u = 285 ÷ 15 = 19
Difference in the number of stickers between Mark and Albert at first
= 4 u - 1 u
= 3 u
= 3 x 19
= 57
Answer(s): 57