Glen has 9 post-it notes more than Dana. How many post-it notes must Dana get from Glen so that she has 21 post-it notes more than him?
| |
Glen |
Dana |
Comparing Glen
and Dana
at first |
9 more |
|
| Before |
|
|
| Change |
- ? |
+ ? |
| After |
|
|
Comparing Glen
and Dana
in the end |
|
21 more |
If Glen gives 9 post-it notes to Dana, she will have 9 more post-it notes than him. However, Dana must have 21 more post-it notes than Glen in the end. So, Glen has to give Dana more post-it notes.
Number of more post-it notes that Glen has to give to Dana
= (21 - 9) ÷ 2
= 12 ÷ 2
= 6
So after giving 9 post-it notes to Dana, Glen has to give her another 6 more post-it notes so that she has 21 post-it notes more than him.
Total number of post-it notes that Dana needs to get from Glen
= 9 + 6
= 15
Answer(s): 15
