The park tickets are priced at $18 and $10.  The number of $18-dollar tickets available is  2³₄ that of the number of $10-dollar tickets. 2 out of 5 of the $18-dollar tickets and all the $10-dollar tickets were sold. The ticket sales amounted to $3576. How much more would have been collected if all the tickets were sold?

	$18	$10
Comparing $18 and $10 tickets at first	11x5 = 55 u	4x5 = 20 u
Before	5x11 = 55 u
Change	- 2x11 = - 22 u	- 20 u
After	3x11 = 33 u	0 u

The number of 18 tickets at first is repeated.  Make the number of 18 tickets the same.  LCM of 5 and 11 is 55.

2³₄ = ¹¹₄

Number of $18 tickets : $10 tickets = 11 : 4

	$18	$10	Total
Number	22 u	20 u
Value	$18	$10
Total value	396 u	200 u	$3576

Total amount collected from the sale of the sold tickets
= 396 u + 200 u
= 596 u

1 u = 3576 ÷ 596 = 6

Number of $18-tickets left unsold
= 33 u 
= 33 x 6
= 198

More amount to be collected if all the tickets were sold
= 198 x 18
= $3564

Answer(s): $3564