The ratio of white to gold stamps that Hilda had was 5 : 4. The cost of each of the white stamps was $2 and the cost of each of the gold stamps was $3. Hilda sold 60% of the white stamps and the total cost of the unsold stamps was $96. How many white stamps did she have left?
| |
White stamps |
Gold stamps |
| Before |
5 u |
4 u |
| Change |
- 3 u |
|
| After |
2 u |
4 u |
Number of white stamps sold
= 60% x 5 u
=
60100 x 5 u
= 3 u
| |
White stamps |
Gold stamps |
Total |
| Number |
2 u |
4 u |
|
| Value |
$2 |
$3 |
|
| Total value |
4 u |
12 u |
$96 |
Total cost of unsold stamps
= 4 u + 12 u
= 16 u
16 u = 96
1 u = 96 ÷ 16 = 6
Number of white stamps that Hilda had left
= 4 u
= 4 x 6
= 24
Answer(s): 24
