Last week, Seth had a total of 310 black and yellow markers. Two weeks later, he sold
34 of all the black markers and 30 yellow markers. Now he has the same number of black and yellow markers. How many markers does he have in the end?
| |
Black |
Yellow |
Total |
| Before |
4 u |
1 u + 30 |
5 u + 30 |
| Change |
- 3 u |
- 30 |
|
| After |
1 u |
1 u |
|
Comparing the black
and yellow markers in the end |
1 |
1 |
|
Total number of markers at first
= 4 u + 1 u + 30
= 5 u + 30
5 u + 30 = 310
5 u = 310 - 30
5 u = 280
1 u = 280 ÷ 5 = 56
Number of markers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 56
= 112
Answer(s): 112
