PSLE Vincent, Billy and Riordan had 162 stickers altogether. Vincent gave
320 of his stickers to Billy and
25 of his stickers to Riordan. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Billy and Riordan at first?
|
Vincent |
Billy |
Riordan |
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 Vincent, Billy and Riordan in the end |
1x9 = 9 u |
1x9 = 9 u |
1x9 = 9 u |
3x9 = 27 u |
Fraction of stickers that Vincent had left
= 1 -
320 -
25 = 1 -
320 -
820 =
920 Total number of stickers
= 3 x 9 u
= 27 u
27 u = 162
1 u = 162 ÷ 27 = 6
Difference in the number of stickers between Billy and Riordan at first
= 6 u - 1 u
= 5 u
= 5 x 6
= 30
Answer(s): 30