Olivia, Wendy and Xuan have 399 erasers altogether. After Wendy gave Xuan 51 erasers and Xuan gave Olivia 10 erasers, they all have equal number of erasers.
- How many erasers did each girl have in the end?
- How many erasers did Xuan have at first?
|
Olivia |
Wendy |
Xuan |
Total |
Before |
|
|
? |
399 |
Change 1 |
|
- 51 |
+ 51 |
|
Change 2 |
+ 10 |
|
- 10 |
|
After |
133 |
133 |
133 |
399 |
(a)
Number of erasers that each of them had in the end
= 399 ÷ 3
= 133
(b)
Number of erasers that Xuan had at first
= 133 + 10 - 51
= 92
Answer(s): (a) 133; (b) 92