There are 20 stickers in Box A and 15 stickers in Box B.
Some stickers are transferred from Box A to Box B.
Box B has 15 more stickers than Box A.
How many stickers are transferred from Box A to Box B?
|
Box A |
Box B |
Before |
20 |
15 |
Change |
- ? |
+ ? |
After |
1 u |
1 u + 15 |
Total number of stickers
= 20 + 15
= 35
In the end
Total number of stickers = 1 u + 1 u + 15 = 2 u + 15
The total number of stickers at first and in the end remains unchanged.
2 u + 15 = 35
2 u = 35 - 15 = 20
1 u = 20 ÷ 2 = 10
Number of stickers that are transferred from Box A to Box B
= Number of stickers in Box A at first - Number of stickers in Box A in the end
= 20 - 10
= 10
Answer(s): 10