Owen and Billy had 87 notebooks. After Owen gave 17 notebooks to Billy. Billy, in return, gave half of his notebooks to Owen. In the end, Owen had twice as many notebooks as Billy. How many notebooks did Owen have at first?
| |
Owen |
Billy |
Total |
| Before |
1 u + 17 |
2 u - 17 |
87 |
| Change 1 |
- 17 |
+ 17 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
87 |
Total number of notebooks that Owen and Billy had at first and in the end remains unchanged.
Total number of notebooks
= 2 u + 1 u
= 3 u
1 u = 87 ÷ 3 = 29
Number of notebooks that Owen had at first
= 1 u + 17
= 29 + 17
= 46
Answer(s): 46
