The drama centre had 1280 seats. There were 40% fewer $45-seats than $5-seats. 80% of the $5-seats and some $45-seats were sold. A total of $17060 was collected. How many seats were unsold?

	$45	$5	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 = 1280

1 u = 1280 ÷ 8 = 160

Total number of $5-seat tickets
= 5 u
= 5 x 160
= 800

Number of $5-seat tickets sold
= 80% x 800
= ⁸⁰₁₀₀ x 800
= 640

Amount collected from $5-seat tickets sold
= 640 x 5
= $3200

Amount collected from $45-seat tickets sold
= 17060 - 3200
= $13860

Number of $45-seat tickets sold
= 13860 ÷ 45
= 308

Number of tickets sold
= 640 + 308
= 948

Number of tickets left unsold
= 1280 - 948
= 332

Answer(s): 332