The stadium tickets are priced at $11 and $6.  The number of $11-dollar tickets available is  2¹₄ that of the number of $6-dollar tickets. 3 out of 5 of the $11-dollar tickets and all the $6-dollar tickets were sold. The ticket sales amounted to $1668. How much more would have been collected if all the tickets were sold?

	$11	$6
Comparing $11 and $6 tickets at first	9x5 = 45 u	4x5 = 20 u
Before	5x9 = 45 u
Change	- 3x9 = - 27 u	- 20 u
After	2x9 = 18 u	0 u

The number of 11 tickets at first is repeated.  Make the number of 11 tickets the same.  LCM of 5 and 9 is 45.

2¹₄ = ⁹₄

Number of $11 tickets : $6 tickets = 9 : 4

	$11	$6	Total
Number	27 u	20 u
Value	$11	$6
Total value	297 u	120 u	$1668

Total amount collected from the sale of the sold tickets
= 297 u + 120 u
= 417 u

1 u = 1668 ÷ 417 = 4

Number of $11-tickets left unsold
= 18 u 
= 18 x 4
= 72

More amount to be collected if all the tickets were sold
= 72 x 11
= $792

Answer(s): $792