Andy has 15 paperclips more than Lucy. How many paperclips must Lucy get from Andy so that she has 21 paperclips more than him?
| |
Andy |
Lucy |
Comparing Andy
and Lucy
at first |
15 more |
|
| Before |
|
|
| Change |
- ? |
+ ? |
| After |
|
|
Comparing Andy
and Lucy
in the end |
|
21 more |
If Andy gives 15 paperclips to Lucy, she will have 15 more paperclips than him. However, Lucy must have 21 more paperclips than Andy in the end. So, Andy has to give Lucy more paperclips.
Number of more paperclips that Andy has to give to Lucy
= (21 - 15) ÷ 2
= 6 ÷ 2
= 3
So after giving 15 paperclips to Lucy, Andy has to give her another 3 more paperclips so that she has 21 paperclips more than him.
Total number of paperclips that Lucy needs to get from Andy
= 15 + 3
= 18
Answer(s): 18
