PSLE Riordan, Ryan and Pierre had 405 stickers altogether. Riordan gave
320 of his stickers to Ryan and
25 of his stickers to Pierre. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Ryan and Pierre at first?
|
Riordan |
Ryan |
Pierre |
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 Riordan, Ryan and Pierre in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Riordan had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 405
1 u = 405 ÷ 27 = 15
Difference in the number of stickers between Ryan and Pierre at first
= 6 u - 1 u
= 5 u
= 5 x 15
= 75
Answer(s): 75