There are 85 stickers in Box B and 75 stickers in Box C.
Some stickers are transferred from Box B to Box C.
Box C has 20 more stickers than Box B.
How many stickers are transferred from Box B to Box C?
|
Box B |
Box C |
Before |
85 |
75 |
Change |
- ? |
+ ? |
After |
1 u |
1 u + 20 |
Total number of stickers
= 85 + 75
= 160
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 = 160
2 u = 160 - 20 = 140
1 u = 140 ÷ 2 = 70
Number of stickers that are transferred from Box B to Box C
= Number of stickers in Box B at first - Number of stickers in Box B in the end
= 85 - 70
= 15
Answer(s): 15