Last week, Wesley had a total of 224 white and yellow pens. Two weeks later, he sold
23 of all the white pens and bought another 12 yellow pens. Now he has the same number of white and yellow pens. How many pens does he have in the end?
| |
White |
Yellow |
Total |
| Before |
3 u |
1 u - 12 |
4 u - 12 |
| Change |
- 2 u |
+ 12 |
|
| After |
1 u |
1 u |
|
Comparing the white
and yellow pens in the end |
1 |
1 |
|
Total number of pens at first
= 3 u + 1 u - 12
= 4 u - 12
4 u - 12 = 224
4 u = 224 + 12
4 u = 236
1 u = 236 ÷ 4 = 59
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 59
= 118
Answer(s): 118
