The ratio of pink to grey stamps that Gillian had was 5 : 4. The cost of each of the pink stamps was $5 and the cost of each of the grey stamps was $9. Gillian sold 60% of the pink stamps and the total cost of the unsold stamps was $276. How many pink stamps did she have left?
| |
Pink stamps |
Grey stamps |
| Before |
5 u |
4 u |
| Change |
- 3 u |
|
| After |
2 u |
4 u |
Number of pink stamps sold
= 60% x 5 u
=
60100 x 5 u
= 3 u
| |
Pink stamps |
Grey stamps |
Total |
| Number |
2 u |
4 u |
|
| Value |
$5 |
$9 |
|
| Total value |
10 u |
36 u |
$276 |
Total cost of unsold stamps
= 10 u + 36 u
= 46 u
46 u = 276
1 u = 276 ÷ 46 = 6
Number of pink stamps that Gillian had left
= 10 u
= 10 x 6
= 60
Answer(s): 60
