The stadium tickets are priced at $25 and $18.  The number of $25-dollar tickets available is  1¹₅ that of the number of $18-dollar tickets. 3 out of 4 of the $25-dollar tickets and all the $18-dollar tickets were sold. The ticket sales amounted to $4860. How much more would have been collected if all the tickets were sold?

	$25	$18
Comparing $25 and $18 tickets at first	6x2 = 12 u	5x2 = 10 u
Before	4x3 = 12 u
Change	- 3x3 = - 9 u	- 10 u
After	1x3 = 3 u	0 u

The number of 25 tickets at first is repeated.  Make the number of 25 tickets the same.  LCM of 4 and 6 is 12.

1¹₅ = ⁶₅

Number of $25 tickets : $18 tickets = 6 : 5

	$25	$18	Total
Number	9 u	10 u
Value	$25	$18
Total value	225 u	180 u	$4860

Total amount collected from the sale of the sold tickets
= 225 u + 180 u
= 405 u

1 u = 4860 ÷ 405 = 12

Number of $25-tickets left unsold
= 3 u 
= 3 x 12
= 36

More amount to be collected if all the tickets were sold
= 36 x 25
= $900

Answer(s): $900