Last week, Vaidev had a total of 138 silver and pink pencils. Two weeks later, he sold
23 of all the silver pencils and bought another 6 pink pencils. Now he has the same number of silver and pink pencils. How many pencils does he have in the end?
| |
Silver |
Pink |
Total |
| Before |
3 u |
1 u - 6 |
4 u - 6 |
| Change |
- 2 u |
+ 6 |
|
| After |
1 u |
1 u |
|
Comparing the silver
and pink pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 3 u + 1 u - 6
= 4 u - 6
4 u - 6 = 138
4 u = 138 + 6
4 u = 144
1 u = 144 ÷ 4 = 36
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 36
= 72
Answer(s): 72
