The ratio of yellow to pink stamps that Tina had was 5 : 3. The cost of each of the yellow stamps was $5 and the cost of each of the pink stamps was $10. Tina sold 60% of the yellow stamps and the total cost of the unsold stamps was $480. How many pink stamps did she have left?
| |
Yellow stamps |
Pink stamps |
| Before |
5 u |
3 u |
| Change |
- 3 u |
|
| After |
2 u |
3 u |
Number of yellow stamps sold
= 60% x 5 u
=
60100 x 5 u
= 3 u
| |
Yellow stamps |
Pink stamps |
Total |
| Number |
2 u |
3 u |
|
| Value |
$5 |
$10 |
|
| Total value |
10 u |
30 u |
$480 |
Total cost of unsold stamps
= 10 u + 30 u
= 40 u
40 u = 480
1 u = 480 ÷ 40 = 12
Number of pink stamps that Tina had left
= 30 u
= 30 x 12
= 360
Answer(s): 360
