The auditorium had 2288 seats. There were 40% fewer $35-seats than $20-seats. 80% of the $20-seats and some $35-seats were sold. A total of $36950 was collected. How many seats were unsold?

	$35	$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 = 2288

1 u = 2288 ÷ 8 = 286

Total number of $20-seat tickets
= 5 u
= 5 x 286
= 1430

Number of $20-seat tickets sold
= 80% x 1430
= ⁸⁰₁₀₀ x 1430
= 1144

Amount collected from $20-seat tickets sold
= 1144 x 20
= $22880

Amount collected from $35-seat tickets sold
= 36950 - 22880
= $14070

Number of $35-seat tickets sold
= 14070 ÷ 35
= 402

Number of tickets sold
= 1144 + 402
= 1546

Number of tickets left unsold
= 2288 - 1546
= 742

Answer(s): 742