Last week, David had a total of 144 white and blue pencils. Two weeks later, he sold
34 of all the white pencils and 29 blue pencils. Now he has the same number of white and blue pencils. How many pencils does he have in the end?
| |
White |
Blue |
Total |
| Before |
4 u |
1 u + 29 |
5 u + 29 |
| Change |
- 3 u |
- 29 |
|
| After |
1 u |
1 u |
|
Comparing the white
and blue pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 4 u + 1 u + 29
= 5 u + 29
5 u + 29 = 144
5 u = 144 - 29
5 u = 115
1 u = 115 ÷ 5 = 23
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 23
= 46
Answer(s): 46
