The drama centre had 2360 seats. There were 40% fewer $35-seats than $15-seats. 60% of the $15-seats and some $35-seats were sold. A total of $25035 was collected. How many seats were unsold?

	$35	$15	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 $15-seat tickets
= 5 u
= 5 x 295
= 1475

Number of $15-seat tickets sold
= 60% x 1475
= ⁶⁰₁₀₀ x 1475
= 885

Amount collected from $15-seat tickets sold
= 885 x 15
= $13275

Amount collected from $35-seat tickets sold
= 25035 - 13275
= $11760

Number of $35-seat tickets sold
= 11760 ÷ 35
= 336

Number of tickets sold
= 885 + 336
= 1221

Number of tickets left unsold
= 2360 - 1221
= 1139

Answer(s): 1139