Last week, Jeremy had a total of 75 black and green notebooks. Two weeks later, he sold
56 of all the black notebooks and bought another 16 green notebooks. Now he has the same number of black and green notebooks. How many notebooks does he have in the end?
| |
Black |
Green |
Total |
| Before |
6 u |
1 u - 16 |
7 u - 16 |
| Change |
- 5 u |
+ 16 |
|
| After |
1 u |
1 u |
|
Comparing the black
and green notebooks in the end |
1 |
1 |
|
Total number of notebooks at first
= 6 u + 1 u - 16
= 7 u - 16
7 u - 16 = 75
7 u = 75 + 16
7 u = 91
1 u = 91 ÷ 7 = 13
Number of notebooks that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 13
= 26
Answer(s): 26
