Last week, Warren had a total of 128 green and gold notebooks. Two weeks later, he sold
45 of all the green notebooks and bought another 4 gold notebooks. Now he has the same number of green and gold notebooks. How many notebooks does he have in the end?
| |
Green |
Gold |
Total |
| Before |
5 u |
1 u - 4 |
6 u - 4 |
| Change |
- 4 u |
+ 4 |
|
| After |
1 u |
1 u |
|
Comparing the green
and gold notebooks in the end |
1 |
1 |
|
Total number of notebooks at first
= 5 u + 1 u - 4
= 6 u - 4
6 u - 4 = 128
6 u = 128 + 4
6 u = 132
1 u = 132 ÷ 6 = 22
Number of notebooks that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 22
= 44
Answer(s): 44
