Oliver has
45 as many buttons as Eric. They have a total of 252 buttons. How many buttons must Eric give to Oliver so that they will have the same number of buttons?
|
Oliver |
Eric |
Total |
Before |
4 u |
5 u |
9 u |
Change |
+ ? |
- ? |
|
After |
126 |
126 |
252 |
Total number of buttons
= 4 u + 5 u
= 9 u
9 u = 252
1 u = 252 ÷ 9 = 28
Number of buttons that each of them has in the end
= 252 ÷ 2
= 126
Number of buttons that Oliver has
= 4 u
= 4 x 28
= 112
Number of buttons that Eric must give Oliver
= 126 - 112
= 14
Answer(s): 14