Last week, Xavier had a total of 197 grey and brown pens. Two weeks later, he sold
23 of all the grey pens and 9 brown pens. Now he has the same number of grey and brown pens. How many pens does he have in the end?
| |
Grey |
Brown |
Total |
| Before |
3 u |
1 u + 9 |
4 u + 9 |
| Change |
- 2 u |
- 9 |
|
| After |
1 u |
1 u |
|
Comparing the grey
and brown pens in the end |
1 |
1 |
|
Total number of pens at first
= 3 u + 1 u + 9
= 4 u + 9
4 u + 9 = 197
4 u = 197 - 9
4 u = 188
1 u = 188 ÷ 4 = 47
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 47
= 94
Answer(s): 94
