Ryan and Fabian had 78 notebooks. After Ryan gave 13 notebooks to Fabian. Fabian, in return, gave half of his notebooks to Ryan. In the end, Ryan had twice as many notebooks as Fabian. How many notebooks did Ryan have at first?
| |
Ryan |
Fabian |
Total |
| Before |
1 u + 13 |
2 u - 13 |
78 |
| Change 1 |
- 13 |
+ 13 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
78 |
Total number of notebooks that Ryan and Fabian had at first and in the end remains unchanged.
Total number of notebooks
= 2 u + 1 u
= 3 u
1 u = 78 ÷ 3 = 26
Number of notebooks that Ryan had at first
= 1 u + 13
= 26 + 13
= 39
Answer(s): 39
