The stadium tickets are priced at $24 and $15.  The number of $24-dollar tickets available is  2¹₂ that of the number of $15-dollar tickets. 3 out of 4 of the $24-dollar tickets and all the $15-dollar tickets were sold. The ticket sales amounted to $2880. How much more would have been collected if all the tickets were sold?

	$24	$15
Comparing $24 and $15 tickets at first	5x4 = 20 u	2x4 = 8 u
Before	4x5 = 20 u
Change	- 3x5 = - 15 u	- 8 u
After	1x5 = 5 u	0 u

The number of 24 tickets at first is repeated.  Make the number of 24 tickets the same.  LCM of 4 and 5 is 20.

2¹₂ = ⁵₂

Number of $24 tickets : $15 tickets = 5 : 2

	$24	$15	Total
Number	15 u	8 u
Value	$24	$15
Total value	360 u	120 u	$2880

Total amount collected from the sale of the sold tickets
= 360 u + 120 u
= 480 u

1 u = 2880 ÷ 480 = 6

Number of $24-tickets left unsold
= 5 u 
= 5 x 6
= 30

More amount to be collected if all the tickets were sold
= 30 x 24
= $720

Answer(s): $720