The ratio of yellow to brown stamps that Eva had was 4 : 3. The cost of each of the yellow stamps was $3 and the cost of each of the brown stamps was $8. Eva sold 25% of the yellow stamps and the total cost of the unsold stamps was $66. How many brown stamps did she have left?
| |
Yellow stamps |
Brown stamps |
| Before |
4 u |
3 u |
| Change |
- 1 u |
|
| After |
3 u |
3 u |
Number of yellow stamps sold
= 25% x 4 u
=
25100 x 4 u
= 1 u
| |
Yellow stamps |
Brown stamps |
Total |
| Number |
3 u |
3 u |
|
| Value |
$3 |
$8 |
|
| Total value |
9 u |
24 u |
$66 |
Total cost of unsold stamps
= 9 u + 24 u
= 33 u
33 u = 66
1 u = 66 ÷ 33 = 2
Number of brown stamps that Eva had left
= 24 u
= 24 x 2
= 48
Answer(s): 48
