The ratio of white to blue stamps that Pamela had was 5 : 4. The cost of each of the white stamps was $4 and the cost of each of the blue stamps was $8. Pamela sold 40% of the white stamps and the total cost of the unsold stamps was $484. How many white stamps did she have left?
| |
White stamps |
Blue stamps |
| Before |
5 u |
4 u |
| Change |
- 2 u |
|
| After |
3 u |
4 u |
Number of white stamps sold
= 40% x 5 u
=
40100 x 5 u
= 2 u
| |
White stamps |
Blue stamps |
Total |
| Number |
3 u |
4 u |
|
| Value |
$4 |
$8 |
|
| Total value |
12 u |
32 u |
$484 |
Total cost of unsold stamps
= 12 u + 32 u
= 44 u
44 u = 484
1 u = 484 ÷ 44 = 11
Number of white stamps that Pamela had left
= 12 u
= 12 x 11
= 132
Answer(s): 132
