The ratio of purple to yellow stamps that Joelle had was 4 : 3. The cost of each of the purple stamps was $2 and the cost of each of the yellow stamps was $6. Joelle sold 25% of the purple stamps and the total cost of the unsold stamps was $264. How many purple stamps did she have left?
| |
Purple stamps |
Yellow stamps |
| Before |
4 u |
3 u |
| Change |
- 1 u |
|
| After |
3 u |
3 u |
Number of purple stamps sold
= 25% x 4 u
=
25100 x 4 u
= 1 u
| |
Purple stamps |
Yellow stamps |
Total |
| Number |
3 u |
3 u |
|
| Value |
$2 |
$6 |
|
| Total value |
6 u |
18 u |
$264 |
Total cost of unsold stamps
= 6 u + 18 u
= 24 u
24 u = 264
1 u = 264 ÷ 24 = 11
Number of purple stamps that Joelle had left
= 6 u
= 6 x 11
= 66
Answer(s): 66
