The ratio of brown to gold stamps that Erika had was 5 : 4. The cost of each of the brown stamps was $4 and the cost of each of the gold stamps was $6. Erika sold 60% of the brown stamps and the total cost of the unsold stamps was $352. How many brown stamps did she have left?
| |
Brown stamps |
Gold stamps |
| Before |
5 u |
4 u |
| Change |
- 3 u |
|
| After |
2 u |
4 u |
Number of brown stamps sold
= 60% x 5 u
=
60100 x 5 u
= 3 u
| |
Brown stamps |
Gold stamps |
Total |
| Number |
2 u |
4 u |
|
| Value |
$4 |
$6 |
|
| Total value |
8 u |
24 u |
$352 |
Total cost of unsold stamps
= 8 u + 24 u
= 32 u
32 u = 352
1 u = 352 ÷ 32 = 11
Number of brown stamps that Erika had left
= 8 u
= 8 x 11
= 88
Answer(s): 88
