Oliver and Owen had 66 notebooks. After Oliver gave 17 notebooks to Owen. Owen, in return, gave half of his notebooks to Oliver. In the end, Oliver had twice as many notebooks as Owen. How many notebooks did Oliver have at first?
| |
Oliver |
Owen |
Total |
| Before |
1 u + 17 |
2 u - 17 |
66 |
| Change 1 |
- 17 |
+ 17 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
66 |
Total number of notebooks that Oliver and Owen had at first and in the end remains unchanged.
Total number of notebooks
= 2 u + 1 u
= 3 u
1 u = 66 ÷ 3 = 22
Number of notebooks that Oliver had at first
= 1 u + 17
= 22 + 17
= 39
Answer(s): 39
