Sam has 13 post-it notes more than Shiyun. How many post-it notes must Shiyun get from Sam so that she has 27 post-it notes more than him?
| |
Sam |
Shiyun |
Comparing Sam
and Shiyun
at first |
13 more |
|
| Before |
|
|
| Change |
- ? |
+ ? |
| After |
|
|
Comparing Sam
and Shiyun
in the end |
|
27 more |
If Sam gives 13 post-it notes to Shiyun, she will have 13 more post-it notes than him. However, Shiyun must have 27 more post-it notes than Sam in the end. So, Sam has to give Shiyun more post-it notes.
Number of more post-it notes that Sam has to give to Shiyun
= (27 - 13) ÷ 2
= 14 ÷ 2
= 7
So after giving 13 post-it notes to Shiyun, Sam has to give her another 7 more post-it notes so that she has 27 post-it notes more than him.
Total number of post-it notes that Shiyun needs to get from Sam
= 13 + 7
= 20
Answer(s): 20
