There are 100 stickers in Box X and 30 stickers in Box Y.
Some stickers are transferred from Box X to Box Y.
Box Y has 20 more stickers than Box X.
How many stickers are transferred from Box X to Box Y?
|
Box X |
Box Y |
Before |
100 |
30 |
Change |
- ? |
+ ? |
After |
1 u |
1 u + 20 |
Total number of stickers
= 100 + 30
= 130
In the end
Total number of stickers = 1 u + 1 u + 20 = 2 u + 20
The total number of stickers at first and in the end remains unchanged.
2 u + 20 = 130
2 u = 130 - 20 = 110
1 u = 110 ÷ 2 = 55
Number of stickers that are transferred from Box X to Box Y
= Number of stickers in Box X at first - Number of stickers in Box X in the end
= 100 - 55
= 45
Answer(s): 45