There are 90 stickers in Box X and 80 stickers in Box Y.
Some stickers are transferred from Box X to Box Y.
Box Y has 30 more stickers than Box X.
How many stickers are transferred from Box X to Box Y?
|
Box X |
Box Y |
Before |
90 |
80 |
Change |
- ? |
+ ? |
After |
1 u |
1 u + 30 |
Total number of stickers
= 90 + 80
= 170
In the end
Total number of stickers = 1 u + 1 u + 30 = 2 u + 30
The total number of stickers at first and in the end remains unchanged.
2 u + 30 = 170
2 u = 170 - 30 = 140
1 u = 140 ÷ 2 = 70
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
= 90 - 70
= 20
Answer(s): 20