Last week, Nick had a total of 278 yellow and black pencils. Two weeks later, he sold
34 of all the yellow pencils and 18 black pencils. Now he has the same number of yellow and black pencils. How many pencils does he have in the end?
| |
Yellow |
Black |
Total |
| Before |
4 u |
1 u + 18 |
5 u + 18 |
| Change |
- 3 u |
- 18 |
|
| After |
1 u |
1 u |
|
Comparing the yellow
and black pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 4 u + 1 u + 18
= 5 u + 18
5 u + 18 = 278
5 u = 278 - 18
5 u = 260
1 u = 260 ÷ 5 = 52
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 52
= 104
Answer(s): 104
