Last week, Liam had a total of 46 red and pink pencils. Two weeks later, he sold
34 of all the red pencils and bought another 4 pink pencils. Now he has the same number of red and pink pencils. How many pencils does he have in the end?
| |
Red |
Pink |
Total |
| Before |
4 u |
1 u - 4 |
5 u - 4 |
| Change |
- 3 u |
+ 4 |
|
| After |
1 u |
1 u |
|
Comparing the red
and pink pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 4 u + 1 u - 4
= 5 u - 4
5 u - 4 = 46
5 u = 46 + 4
5 u = 50
1 u = 50 ÷ 5 = 10
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 10
= 20
Answer(s): 20
