The drama centre had 1512 seats. There were 40% fewer $50-seats than $20-seats. 80% of the $20-seats and some $50-seats were sold. A total of $30270 was collected. How many seats were unsold?
|
$50 |
$20 |
Total |
Number |
3 u |
5 u |
8 u |
100% - 40% = 60%
60100 =
35 Total number of seats
= 3 u + 5 u
= 8 u
8 u = 1512
1 u = 1512 ÷ 8 = 189
Total number of $20-seat tickets
= 5 u
= 5 x 189
= 945
Number of $20-seat tickets sold
= 80% x 945
=
80100 x 945
= 756
Amount collected from $20-seat tickets sold
= 756 x 20
= $15120
Amount collected from $50-seat tickets sold
= 30270 - 15120
= $15150
Number of $50-seat tickets sold
= 15150 ÷ 50
= 303
Number of tickets sold
= 756 + 303
= 1059
Number of tickets left unsold
= 1512 - 1059
= 453
Answer(s): 453