The ratio of white to blue stamps that Raeann had was 5 : 3. The cost of each of the white stamps was $3 and the cost of each of the blue stamps was $6. Raeann sold 40% of the white stamps and the total cost of the unsold stamps was $270. How many white stamps did she have left?
| |
White stamps |
Blue stamps |
| Before |
5 u |
3 u |
| Change |
- 2 u |
|
| After |
3 u |
3 u |
Number of white stamps sold
= 40% x 5 u
=
40100 x 5 u
= 2 u
| |
White stamps |
Blue stamps |
Total |
| Number |
3 u |
3 u |
|
| Value |
$3 |
$6 |
|
| Total value |
9 u |
18 u |
$270 |
Total cost of unsold stamps
= 9 u + 18 u
= 27 u
27 u = 270
1 u = 270 ÷ 27 = 10
Number of white stamps that Raeann had left
= 9 u
= 9 x 10
= 90
Answer(s): 90
