Ethan and Dylan had 63 notebooks. After Ethan gave 16 notebooks to Dylan. Dylan, in return, gave half of his notebooks to Ethan. In the end, Ethan had twice as many notebooks as Dylan. How many notebooks did Ethan have at first?
| |
Ethan |
Dylan |
Total |
| Before |
1 u + 16 |
2 u - 16 |
63 |
| Change 1 |
- 16 |
+ 16 |
|
| 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 Dylan 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 + 16
= 21 + 16
= 37
Answer(s): 37
