Last week, Howard had a total of 85 black and grey markers. Two weeks later, he sold
45 of all the black markers and 19 grey markers. Now he has the same number of black and grey markers. How many markers does he have in the end?
|
Black |
Grey |
Total |
Before |
5 u |
1 u + 19 |
6 u + 19 |
Change |
- 4 u |
- 19 |
|
After |
1 u |
1 u |
|
Comparing the black and grey markers in the end |
1 |
1 |
|
Total number of markers at first
= 5 u + 1 u + 19
= 6 u + 19
6 u + 19 = 85
6 u = 85 - 19
6 u = 66
1 u = 66 ÷ 6 = 11
Number of markers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 11
= 22
Answer(s): 22