Luke and Riordan had a total of 138 buttons. Riordan had half as many buttons as Luke. How many buttons must Luke give to Riordan so they have an equal number of buttons?
|
Luke |
Riordan |
Total |
Before |
2 u |
1 u |
138 |
Change |
- ? |
+ ? |
|
After |
1 |
1 |
|
Total number of buttons at first = 3 u
1 u = 138 ÷ 3 = 46
Luke and Riordan have an equal number of buttons in the end.
Number of buttons that Riordan has in the end
= 138 ÷ 2
= 69
Number of buttons that Luke must give to Riordan
= 69 - 46
= 23
Answer(s): 23