Last week, Jenson had a total of 99 black and green pencils. Two weeks later, he sold
23 of all the black pencils and 7 green pencils. Now he has the same number of black and green pencils. How many pencils does he have in the end?
| |
Black |
Green |
Total |
| Before |
3 u |
1 u + 7 |
4 u + 7 |
| Change |
- 2 u |
- 7 |
|
| After |
1 u |
1 u |
|
Comparing the black
and green pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 3 u + 1 u + 7
= 4 u + 7
4 u + 7 = 99
4 u = 99 - 7
4 u = 92
1 u = 92 ÷ 4 = 23
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 23
= 46
Answer(s): 46
