The ratio of brown to pink stamps that Tiffany had was 4 : 3. The cost of each of the brown stamps was $5 and the cost of each of the pink stamps was $6. Tiffany sold 50% of the brown stamps and the total cost of the unsold stamps was $56. How many pink stamps did she have left?
| |
Brown stamps |
Pink stamps |
| Before |
4 u |
3 u |
| Change |
- 2 u |
|
| After |
2 u |
3 u |
Number of brown stamps sold
= 50% x 4 u
=
50100 x 4 u
= 2 u
| |
Brown stamps |
Pink stamps |
Total |
| Number |
2 u |
3 u |
|
| Value |
$5 |
$6 |
|
| Total value |
10 u |
18 u |
$56 |
Total cost of unsold stamps
= 10 u + 18 u
= 28 u
28 u = 56
1 u = 56 ÷ 28 = 2
Number of pink stamps that Tiffany had left
= 18 u
= 18 x 2
= 36
Answer(s): 36
