The drama centre had 1216 seats. There were 40% fewer $45-seats than $15-seats. 60% of the $15-seats and some $45-seats were sold. A total of $28845 was collected. How many seats were unsold?

	$45	$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 = 1216

1 u = 1216 ÷ 8 = 152

Total number of $15-seat tickets
= 5 u
= 5 x 152
= 760

Number of $15-seat tickets sold
= 60% x 760
= ⁶⁰₁₀₀ x 760
= 456

Amount collected from $15-seat tickets sold
= 456 x 15
= $6840

Amount collected from $45-seat tickets sold
= 28845 - 6840
= $22005

Number of $45-seat tickets sold
= 22005 ÷ 45
= 489

Number of tickets sold
= 456 + 489
= 945

Number of tickets left unsold
= 1216 - 945
= 271

Answer(s): 271