Cole and Tommy had 87 notebooks. After Cole gave 16 notebooks to Tommy. Tommy, in return, gave half of his notebooks to Cole. In the end, Cole had twice as many notebooks as Tommy. How many notebooks did Cole have at first?
| |
Cole |
Tommy |
Total |
| Before |
1 u + 16 |
2 u - 16 |
87 |
| Change 1 |
- 16 |
+ 16 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
87 |
Total number of notebooks that Cole and Tommy 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 Cole had at first
= 1 u + 16
= 29 + 16
= 45
Answer(s): 45
