The ratio of pink to grey stamps that Fiona had was 4 : 3. The cost of each of the pink stamps was $3 and the cost of each of the grey stamps was $8. Fiona sold 25% of the pink stamps and the total cost of the unsold stamps was $297. How many pink stamps did she have left?
| |
Pink stamps |
Grey stamps |
| Before |
4 u |
3 u |
| Change |
- 1 u |
|
| After |
3 u |
3 u |
Number of pink stamps sold
= 25% x 4 u
=
25100 x 4 u
= 1 u
| |
Pink stamps |
Grey stamps |
Total |
| Number |
3 u |
3 u |
|
| Value |
$3 |
$8 |
|
| Total value |
9 u |
24 u |
$297 |
Total cost of unsold stamps
= 9 u + 24 u
= 33 u
33 u = 297
1 u = 297 ÷ 33 = 9
Number of pink stamps that Fiona had left
= 9 u
= 9 x 9
= 81
Answer(s): 81
