The ratio of silver to blue stamps that Vanessa had was 5 : 3. The cost of each of the silver stamps was $1 and the cost of each of the blue stamps was $4. Vanessa sold 20% of the silver stamps and the total cost of the unsold stamps was $176. How many silver stamps did she have left?
| |
Silver stamps |
Blue stamps |
| Before |
5 u |
3 u |
| Change |
- 1 u |
|
| After |
4 u |
3 u |
Number of silver stamps sold
= 20% x 5 u
=
20100 x 5 u
= 1 u
| |
Silver stamps |
Blue stamps |
Total |
| Number |
4 u |
3 u |
|
| Value |
$1 |
$4 |
|
| Total value |
4 u |
12 u |
$176 |
Total cost of unsold stamps
= 4 u + 12 u
= 16 u
16 u = 176
1 u = 176 ÷ 16 = 11
Number of silver stamps that Vanessa had left
= 4 u
= 4 x 11
= 44
Answer(s): 44
