Last week, Cole had a total of 277 red and yellow notebooks. Two weeks later, he sold
56 of all the red notebooks and bought another 10 yellow notebooks. Now he has the same number of red and yellow notebooks. How many notebooks does he have in the end?
| |
Red |
Yellow |
Total |
| Before |
6 u |
1 u - 10 |
7 u - 10 |
| Change |
- 5 u |
+ 10 |
|
| After |
1 u |
1 u |
|
Comparing the red
and yellow notebooks in the end |
1 |
1 |
|
Total number of notebooks at first
= 6 u + 1 u - 10
= 7 u - 10
7 u - 10 = 277
7 u = 277 + 10
7 u = 287
1 u = 287 ÷ 7 = 41
Number of notebooks that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 41
= 82
Answer(s): 82
