Risa, Gem and Zoe have 339 buttons altogether. After Gem gave Zoe 57 buttons and Zoe gave Risa 13 buttons, they all have equal number of buttons.
- How many buttons did each girl have in the end?
- How many buttons did Zoe have at first?
|
Risa |
Gem |
Zoe |
Total |
Before |
|
|
? |
339 |
Change 1 |
|
- 57 |
+ 57 |
|
Change 2 |
+ 13 |
|
- 13 |
|
After |
113 |
113 |
113 |
339 |
(a)
Number of buttons that each of them had in the end
= 339 ÷ 3
= 113
(b)
Number of buttons that Zoe had at first
= 113 + 13 - 57
= 69
Answer(s): (a) 113; (b) 69