The bird park tickets are priced at $8 and $5.  The number of $8-dollar tickets available is  1¹₃ that of the number of $5-dollar tickets. 2 out of 5 of the $8-dollar tickets and all the $5-dollar tickets were sold. The ticket sales amounted to $1529. How much more would have been collected if all the tickets were sold?

	$8	$5
Comparing $8 and $5 tickets at first	4x5 = 20 u	3x5 = 15 u
Before	5x4 = 20 u
Change	- 2x4 = - 8 u	- 15 u
After	3x4 = 12 u	0 u

The number of 8 tickets at first is repeated.  Make the number of 8 tickets the same.  LCM of 5 and 4 is 20.

1¹₃ = ⁴₃

Number of $8 tickets : $5 tickets = 4 : 3

	$8	$5	Total
Number	8 u	15 u
Value	$8	$5
Total value	64 u	75 u	$1529

Total amount collected from the sale of the sold tickets
= 64 u + 75 u
= 139 u

1 u = 1529 ÷ 139 = 11

Number of $8-tickets left unsold
= 12 u 
= 12 x 11
= 132

More amount to be collected if all the tickets were sold
= 132 x 8
= $1056

Answer(s): $1056