The zoo tickets are priced at $10 and $7.  The number of $10-dollar tickets available is  2²₅ that of the number of $7-dollar tickets. 3 out of 7 of the $10-dollar tickets and all the $7-dollar tickets were sold. The ticket sales amounted to $7260. How much more would have been collected if all the tickets were sold?

	$10	$7
Comparing $10 and $7 tickets at first	12x7 = 84 u	5x7 = 35 u
Before	7x12 = 84 u
Change	- 3x12 = - 36 u	- 35 u
After	4x12 = 48 u	0 u

The number of 10 tickets at first is repeated.  Make the number of 10 tickets the same.  LCM of 7 and 12 is 84.

2²₅ = ¹²₅

Number of $10 tickets : $7 tickets = 12 : 5

	$10	$7	Total
Number	36 u	35 u
Value	$10	$7
Total value	360 u	245 u	$7260

Total amount collected from the sale of the sold tickets
= 360 u + 245 u
= 605 u

1 u = 7260 ÷ 605 = 12

Number of $10-tickets left unsold
= 48 u 
= 48 x 12
= 576

More amount to be collected if all the tickets were sold
= 576 x 10
= $5760

Answer(s): $5760