The ratio of pink to green stamps that Jen had was 5 : 3. The cost of each of the pink stamps was $3 and the cost of each of the green stamps was $4. Jen sold 40% of the pink stamps and the total cost of the unsold stamps was $231. How many pink stamps did she have left?
| |
Pink stamps |
Green stamps |
| Before |
5 u |
3 u |
| Change |
- 2 u |
|
| After |
3 u |
3 u |
Number of pink stamps sold
= 40% x 5 u
=
40100 x 5 u
= 2 u
| |
Pink stamps |
Green stamps |
Total |
| Number |
3 u |
3 u |
|
| Value |
$3 |
$4 |
|
| Total value |
9 u |
12 u |
$231 |
Total cost of unsold stamps
= 9 u + 12 u
= 21 u
21 u = 231
1 u = 231 ÷ 21 = 11
Number of pink stamps that Jen had left
= 9 u
= 9 x 11
= 99
Answer(s): 99
