Ethan and Brandon had 63 notebooks. After Ethan gave 19 notebooks to Brandon. Brandon, in return, gave half of his notebooks to Ethan. In the end, Ethan had twice as many notebooks as Brandon. How many notebooks did Ethan have at first?
| |
Ethan |
Brandon |
Total |
| Before |
1 u + 19 |
2 u - 19 |
63 |
| Change 1 |
- 19 |
+ 19 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
63 |
Total number of notebooks that Ethan and Brandon had at first and in the end remains unchanged.
Total number of notebooks
= 2 u + 1 u
= 3 u
1 u = 63 ÷ 3 = 21
Number of notebooks that Ethan had at first
= 1 u + 19
= 21 + 19
= 40
Answer(s): 40
