Last week, Luke had a total of 144 black and red markers. Two weeks later, he sold
23 of all the black markers and 24 red markers. Now he has the same number of black and red markers. How many markers does he have in the end?
| |
Black |
Red |
Total |
| Before |
3 u |
1 u + 24 |
4 u + 24 |
| Change |
- 2 u |
- 24 |
|
| After |
1 u |
1 u |
|
Comparing the black
and red markers in the end |
1 |
1 |
|
Total number of markers at first
= 3 u + 1 u + 24
= 4 u + 24
4 u + 24 = 144
4 u = 144 - 24
4 u = 120
1 u = 120 ÷ 4 = 30
Number of markers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 30
= 60
Answer(s): 60
