The drama centre had 1358 seats. There were 25% fewer $50-seats than $5-seats. 75% of the $5-seats and some $50-seats were sold. A total of $27360 was collected. How many seats were unsold?

	$50	$5	Total
Number	3 u	4 u	7 u

100% - 25% = 75%
⁷⁵₁₀₀ = ³₄

Total number of seats
= 3 u + 4 u
= 7 u

7 u = 1358

1 u = 1358 ÷ 7 = 194

Total number of $5-seat tickets
= 4 u
= 4 x 194
= 776

Number of $5-seat tickets sold
= 75% x 776
= ⁷⁵₁₀₀ x 776
= 582

Amount collected from $5-seat tickets sold
= 582 x 5
= $2910

Amount collected from $50-seat tickets sold
= 27360 - 2910
= $24450

Number of $50-seat tickets sold
= 24450 ÷ 50
= 489

Number of tickets sold
= 582 + 489
= 1071

Number of tickets left unsold
= 1358 - 1071
= 287

Answer(s): 287