PSLE Andy, Tommy and Henry had 540 stickers altogether. Andy gave
320 of his stickers to Tommy and
14 of his stickers to Henry. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Tommy and Henry at first?
|
Andy |
Tommy |
Henry |
Total |
Before |
20 u |
9 u |
7 u |
36 u |
Change 1 |
- 3 u |
+ 3 u |
|
|
Change 2 |
- 5 u |
|
+ 5 u |
|
After |
12 u |
12 u |
12 u |
36 u |
Comparing between Andy, Tommy and Henry in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Andy had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 540
1 u = 540 ÷ 36 = 15
Difference in the number of stickers between Tommy and Henry at first
= 9 u - 7 u
= 2 u
= 2 x 15
= 30
Answer(s): 30