The ratio of purple to yellow stamps that Zara had was 4 : 3. The cost of each of the purple stamps was $4 and the cost of each of the yellow stamps was $6. Zara sold 50% of the purple stamps and the total cost of the unsold stamps was $260. How many purple stamps did she have left?
| |
Purple stamps |
Yellow stamps |
| Before |
4 u |
3 u |
| Change |
- 2 u |
|
| After |
2 u |
3 u |
Number of purple stamps sold
= 50% x 4 u
=
50100 x 4 u
= 2 u
| |
Purple stamps |
Yellow stamps |
Total |
| Number |
2 u |
3 u |
|
| Value |
$4 |
$6 |
|
| Total value |
8 u |
18 u |
$260 |
Total cost of unsold stamps
= 8 u + 18 u
= 26 u
26 u = 260
1 u = 260 ÷ 26 = 10
Number of purple stamps that Zara had left
= 8 u
= 8 x 10
= 80
Answer(s): 80
