The ratio of yellow to pink stamps that Gabby had was 5 : 4. The cost of each of the yellow stamps was $2 and the cost of each of the pink stamps was $4. Gabby sold 20% of the yellow stamps and the total cost of the unsold stamps was $48. How many pink stamps did she have left?
| |
Yellow stamps |
Pink stamps |
| Before |
5 u |
4 u |
| Change |
- 1 u |
|
| After |
4 u |
4 u |
Number of yellow stamps sold
= 20% x 5 u
=
20100 x 5 u
= 1 u
| |
Yellow stamps |
Pink stamps |
Total |
| Number |
4 u |
4 u |
|
| Value |
$2 |
$4 |
|
| Total value |
8 u |
16 u |
$48 |
Total cost of unsold stamps
= 8 u + 16 u
= 24 u
24 u = 48
1 u = 48 ÷ 24 = 2
Number of pink stamps that Gabby had left
= 16 u
= 16 x 2
= 32
Answer(s): 32
