The bird park tickets are priced at $17 and $15.  The number of $17-dollar tickets available is  1¹₂ that of the number of $15-dollar tickets. 2 out of 5 of the $17-dollar tickets and all the $15-dollar tickets were sold. The ticket sales amounted to $1512. How much more would have been collected if all the tickets were sold?

	$17	$15
Comparing $17 and $15 tickets at first	3x5 = 15 u	2x5 = 10 u
Before	5x3 = 15 u
Change	- 2x3 = - 6 u	- 10 u
After	3x3 = 9 u	0 u

The number of 17 tickets at first is repeated.  Make the number of 17 tickets the same.  LCM of 5 and 3 is 15.

1¹₂ = ³₂

Number of $17 tickets : $15 tickets = 3 : 2

	$17	$15	Total
Number	6 u	10 u
Value	$17	$15
Total value	102 u	150 u	$1512

Total amount collected from the sale of the sold tickets
= 102 u + 150 u
= 252 u

1 u = 1512 ÷ 252 = 6

Number of $17-tickets left unsold
= 9 u 
= 9 x 6
= 54

More amount to be collected if all the tickets were sold
= 54 x 17
= $918

Answer(s): $918