Last week, Lee had a total of 307 brown and yellow notebooks. Two weeks later, he sold
34 of all the brown notebooks and 7 yellow notebooks. Now he has the same number of brown and yellow notebooks. How many notebooks does he have in the end?
| |
Brown |
Yellow |
Total |
| Before |
4 u |
1 u + 7 |
5 u + 7 |
| Change |
- 3 u |
- 7 |
|
| After |
1 u |
1 u |
|
Comparing the brown
and yellow notebooks in the end |
1 |
1 |
|
Total number of notebooks at first
= 4 u + 1 u + 7
= 5 u + 7
5 u + 7 = 307
5 u = 307 - 7
5 u = 300
1 u = 300 ÷ 5 = 60
Number of notebooks that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 60
= 120
Answer(s): 120
