The theatre had 2360 seats. There were 40% fewer $25-seats than $20-seats. 80% of the $20-seats and some $25-seats were sold. A total of $33000 was collected. How many seats were unsold?

	$25	$20	Total
Number	3 u	5 u	8 u

100% - 40% = 60%
⁶⁰₁₀₀ = ³₅

Total number of seats
= 3 u + 5 u
= 8 u

8 u = 2360

1 u = 2360 ÷ 8 = 295

Total number of $20-seat tickets
= 5 u
= 5 x 295
= 1475

Number of $20-seat tickets sold
= 80% x 1475
= ⁸⁰₁₀₀ x 1475
= 1180

Amount collected from $20-seat tickets sold
= 1180 x 20
= $23600

Amount collected from $25-seat tickets sold
= 33000 - 23600
= $9400

Number of $25-seat tickets sold
= 9400 ÷ 25
= 376

Number of tickets sold
= 1180 + 376
= 1556

Number of tickets left unsold
= 2360 - 1556
= 804

Answer(s): 804