The park tickets are priced at $22 and $20.  The number of $22-dollar tickets available is  1²₅ that of the number of $20-dollar tickets. 2 out of 3 of the $22-dollar tickets and all the $20-dollar tickets were sold. The ticket sales amounted to $2432. How much more would have been collected if all the tickets were sold?

	$22	$20
Comparing $22 and $20 tickets at first	7x3 = 21 u	5x3 = 15 u
Before	3x7 = 21 u
Change	- 2x7 = - 14 u	- 15 u
After	1x7 = 7 u	0 u

The number of 22 tickets at first is repeated.  Make the number of 22 tickets the same.  LCM of 3 and 7 is 21.

1²₅ = ⁷₅

Number of $22 tickets : $20 tickets = 7 : 5

	$22	$20	Total
Number	14 u	15 u
Value	$22	$20
Total value	308 u	300 u	$2432

Total amount collected from the sale of the sold tickets
= 308 u + 300 u
= 608 u

1 u = 2432 ÷ 608 = 4

Number of $22-tickets left unsold
= 7 u 
= 7 x 4
= 28

More amount to be collected if all the tickets were sold
= 28 x 22
= $616

Answer(s): $616