Last week, Fred had a total of 330 silver and pink pencils. Two weeks later, he sold
56 of all the silver pencils and 15 pink pencils. Now he has the same number of silver and pink pencils. How many pencils does he have in the end?
| |
Silver |
Pink |
Total |
| Before |
6 u |
1 u + 15 |
7 u + 15 |
| Change |
- 5 u |
- 15 |
|
| After |
1 u |
1 u |
|
Comparing the silver
and pink pencils in the end |
1 |
1 |
|
Total number of pencils at first
= 6 u + 1 u + 15
= 7 u + 15
7 u + 15 = 330
7 u = 330 - 15
7 u = 315
1 u = 315 ÷ 7 = 45
Number of pencils that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 45
= 90
Answer(s): 90
