The stadium tickets are priced at $14 and $8.  The number of $14-dollar tickets available is  1¹₄ that of the number of $8-dollar tickets. 3 out of 7 of the $14-dollar tickets and all the $8-dollar tickets were sold. The ticket sales amounted to $2604. How much more would have been collected if all the tickets were sold?

	$14	$8
Comparing $14 and $8 tickets at first	5x7 = 35 u	4x7 = 28 u
Before	7x5 = 35 u
Change	- 3x5 = - 15 u	- 28 u
After	4x5 = 20 u	0 u

The number of 14 tickets at first is repeated.  Make the number of 14 tickets the same.  LCM of 7 and 5 is 35.

1¹₄ = ⁵₄

Number of $14 tickets : $8 tickets = 5 : 4

	$14	$8	Total
Number	15 u	28 u
Value	$14	$8
Total value	210 u	224 u	$2604

Total amount collected from the sale of the sold tickets
= 210 u + 224 u
= 434 u

1 u = 2604 ÷ 434 = 6

Number of $14-tickets left unsold
= 20 u 
= 20 x 6
= 120

More amount to be collected if all the tickets were sold
= 120 x 14
= $1680

Answer(s): $1680