The bird park tickets are priced at $14 and $5.  The number of $14-dollar tickets available is  1¹₆ that of the number of $5-dollar tickets. 3 out of 5 of the $14-dollar tickets and all the $5-dollar tickets were sold. The ticket sales amounted to $2220. How much more would have been collected if all the tickets were sold?

	$14	$5
Comparing $14 and $5 tickets at first	7x5 = 35 u	6x5 = 30 u
Before	5x7 = 35 u
Change	- 3x7 = - 21 u	- 30 u
After	2x7 = 14 u	0 u

The number of 14 tickets at first is repeated.  Make the number of 14 tickets the same.  LCM of 5 and 7 is 35.

1¹₆ = ⁷₆

Number of $14 tickets : $5 tickets = 7 : 6

	$14	$5	Total
Number	21 u	30 u
Value	$14	$5
Total value	294 u	150 u	$2220

Total amount collected from the sale of the sold tickets
= 294 u + 150 u
= 444 u

1 u = 2220 ÷ 444 = 5

Number of $14-tickets left unsold
= 14 u 
= 14 x 5
= 70

More amount to be collected if all the tickets were sold
= 70 x 14
= $980

Answer(s): $980