Last week, Wesley had a total of 144 silver and white pens. Two weeks later, he sold
34 of all the silver pens and 4 white pens. Now he has the same number of silver and white pens. How many pens does he have in the end?
| |
Silver |
White |
Total |
| Before |
4 u |
1 u + 4 |
5 u + 4 |
| Change |
- 3 u |
- 4 |
|
| After |
1 u |
1 u |
|
Comparing the silver
and white pens in the end |
1 |
1 |
|
Total number of pens at first
= 4 u + 1 u + 4
= 5 u + 4
5 u + 4 = 144
5 u = 144 - 4
5 u = 140
1 u = 140 ÷ 5 = 28
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 28
= 56
Answer(s): 56
