Michael and Harry had 66 notebooks. After Michael gave 20 notebooks to Harry. Harry, in return, gave half of his notebooks to Michael. In the end, Michael had twice as many notebooks as Harry. How many notebooks did Michael have at first?
| |
Michael |
Harry |
Total |
| Before |
1 u + 20 |
2 u - 20 |
66 |
| Change 1 |
- 20 |
+ 20 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
66 |
Total number of notebooks that Michael and Harry 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 Michael had at first
= 1 u + 20
= 22 + 20
= 42
Answer(s): 42
