Last week, Tommy had a total of 199 blue and black markers. Two weeks later, he sold
23 of all the blue markers and bought another 29 black markers. Now he has the same number of blue and black markers. How many markers does he have in the end?
| |
Blue |
Black |
Total |
| Before |
3 u |
1 u - 29 |
4 u - 29 |
| Change |
- 2 u |
+ 29 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and black markers in the end |
1 |
1 |
|
Total number of markers at first
= 3 u + 1 u - 29
= 4 u - 29
4 u - 29 = 199
4 u = 199 + 29
4 u = 228
1 u = 228 ÷ 4 = 57
Number of markers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 57
= 114
Answer(s): 114
