Last week, Tim had a total of 143 purple and silver pencils. Two weeks later, he sold
45 of all the purple pencils and 5 silver pencils. Now he has the same number of purple and silver pencils. How many pencils does he have in the end?
| |
Purple |
Silver |
Total |
| Before |
5 u |
1 u + 5 |
6 u + 5 |
| Change |
- 4 u |
- 5 |
|
| After |
1 u |
1 u |
|
Comparing the purple
and silver pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 5 u + 1 u + 5
= 6 u + 5
6 u + 5 = 143
6 u = 143 - 5
6 u = 138
1 u = 138 ÷ 6 = 23
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 23
= 46
Answer(s): 46
