The ratio of yellow to brown stamps that Vanessa had was 5 : 2. The cost of each of the yellow stamps was $2 and the cost of each of the brown stamps was $3. Vanessa sold 40% of the yellow stamps and the total cost of the unsold stamps was $108. How many yellow stamps did she have left?
|
Yellow stamps |
Brown stamps |
Before |
5 u |
2 u |
Change |
- 2 u |
|
After |
3 u |
2 u |
Number of yellow stamps sold
= 40% x 5 u
=
40100 x 5 u
= 2 u
|
Yellow stamps |
Brown stamps |
Total |
Number |
3 u |
2 u |
|
Value |
$2 |
$3 |
|
Total value |
6 u |
6 u |
$108 |
Total cost of unsold stamps
= 6 u + 6 u
= 12 u
12 u = 108
1 u = 108 ÷ 12 = 9
Number of yellow stamps that Vanessa had left
= 6 u
= 6 x 9
= 54
Answer(s): 54