Last week, Japheth had a total of 98 black and gold pens. Two weeks later, he sold
23 of all the black pens and bought another 14 gold pens. Now he has the same number of black and gold pens. How many pens does he have in the end?
| |
Black |
Gold |
Total |
| Before |
3 u |
1 u - 14 |
4 u - 14 |
| Change |
- 2 u |
+ 14 |
|
| After |
1 u |
1 u |
|
Comparing the black
and gold pens in the end |
1 |
1 |
|
Total number of pens at first
= 3 u + 1 u - 14
= 4 u - 14
4 u - 14 = 98
4 u = 98 + 14
4 u = 112
1 u = 112 ÷ 4 = 28
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 28
= 56
Answer(s): 56
