The safari park tickets are priced at $22 and $13.  The number of $22-dollar tickets available is  2³₅ that of the number of $13-dollar tickets. 2 out of 3 of the $22-dollar tickets and all the $13-dollar tickets were sold. The ticket sales amounted to $3068. How much more would have been collected if all the tickets were sold?

	$22	$13
Comparing $22 and $13 tickets at first	13x3 = 39 u	5x3 = 15 u
Before	3x13 = 39 u
Change	- 2x13 = - 26 u	- 15 u
After	1x13 = 13 u	0 u

The number of 22 tickets at first is repeated.  Make the number of 22 tickets the same.  LCM of 3 and 13 is 39.

2³₅ = ¹³₅

Number of $22 tickets : $13 tickets = 13 : 5

	$22	$13	Total
Number	26 u	15 u
Value	$22	$13
Total value	572 u	195 u	$3068

Total amount collected from the sale of the sold tickets
= 572 u + 195 u
= 767 u

1 u = 3068 ÷ 767 = 4

Number of $22-tickets left unsold
= 13 u 
= 13 x 4
= 52

More amount to be collected if all the tickets were sold
= 52 x 22
= $1144

Answer(s): $1144