The safari park tickets are priced at $11 and $5.  The number of $11-dollar tickets available is  1¹₅ that of the number of $5-dollar tickets. 3 out of 7 of the $11-dollar tickets and all the $5-dollar tickets were sold. The ticket sales amounted to $3357. How much more would have been collected if all the tickets were sold?

	$11	$5
Comparing $11 and $5 tickets at first	6x7 = 42 u	5x7 = 35 u
Before	7x6 = 42 u
Change	- 3x6 = - 18 u	- 35 u
After	4x6 = 24 u	0 u

The number of 11 tickets at first is repeated.  Make the number of 11 tickets the same.  LCM of 7 and 6 is 42.

1¹₅ = ⁶₅

Number of $11 tickets : $5 tickets = 6 : 5

	$11	$5	Total
Number	18 u	35 u
Value	$11	$5
Total value	198 u	175 u	$3357

Total amount collected from the sale of the sold tickets
= 198 u + 175 u
= 373 u

1 u = 3357 ÷ 373 = 9

Number of $11-tickets left unsold
= 24 u 
= 24 x 9
= 216

More amount to be collected if all the tickets were sold
= 216 x 11
= $2376

Answer(s): $2376