Last week, Caden had a total of 193 brown and red pencils. Two weeks later, he sold
45 of all the brown pencils and bought another 17 red pencils. Now he has the same number of brown and red pencils. How many pencils does he have in the end?
| |
Brown |
Red |
Total |
| Before |
5 u |
1 u - 17 |
6 u - 17 |
| Change |
- 4 u |
+ 17 |
|
| After |
1 u |
1 u |
|
Comparing the brown
and red pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 5 u + 1 u - 17
= 6 u - 17
6 u - 17 = 193
6 u = 193 + 17
6 u = 210
1 u = 210 ÷ 6 = 35
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 35
= 70
Answer(s): 70
