The ratio of pink to purple stamps that Zara had was 5 : 4. The cost of each of the pink stamps was $2 and the cost of each of the purple stamps was $5. Zara sold 40% of the pink stamps and the total cost of the unsold stamps was $260. How many pink stamps did she have left?
| |
Pink stamps |
Purple stamps |
| Before |
5 u |
4 u |
| Change |
- 2 u |
|
| After |
3 u |
4 u |
Number of pink stamps sold
= 40% x 5 u
=
40100 x 5 u
= 2 u
| |
Pink stamps |
Purple stamps |
Total |
| Number |
3 u |
4 u |
|
| Value |
$2 |
$5 |
|
| Total value |
6 u |
20 u |
$260 |
Total cost of unsold stamps
= 6 u + 20 u
= 26 u
26 u = 260
1 u = 260 ÷ 26 = 10
Number of pink stamps that Zara had left
= 6 u
= 6 x 10
= 60
Answer(s): 60
