PSLE Ian, Harry and Cody had 396 stickers altogether. Ian gave
320 of his stickers to Harry and
14 of his stickers to Cody. After that, all three boys had the same number of stickers. What was the difference in the number of stickers between Harry and Cody at first?
|
Ian |
Harry |
Cody |
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 Ian, Harry and Cody in the end |
1x12 = 12 u |
1x12 = 12 u |
1x12 = 12 u |
3x12 = 36 u |
Fraction of stickers that Ian had left
= 1 -
320 -
14 = 1 -
320 -
520 =
1220 Total number of stickers
= 3 x 12 u
= 36 u
36 u = 396
1 u = 396 ÷ 36 = 11
Difference in the number of stickers between Harry and Cody at first
= 9 u - 7 u
= 2 u
= 2 x 11
= 22
Answer(s): 22