The drama centre had 1701 seats. There were 25% fewer $30-seats than $5-seats. 75% of the $5-seats and some $30-seats were sold. A total of $13005 was collected. How many seats were unsold?

	$30	$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 = 1701

1 u = 1701 ÷ 7 = 243

Total number of $5-seat tickets
= 4 u
= 4 x 243
= 972

Number of $5-seat tickets sold
= 75% x 972
= ⁷⁵₁₀₀ x 972
= 729

Amount collected from $5-seat tickets sold
= 729 x 5
= $3645

Amount collected from $30-seat tickets sold
= 13005 - 3645
= $9360

Number of $30-seat tickets sold
= 9360 ÷ 30
= 312

Number of tickets sold
= 729 + 312
= 1041

Number of tickets left unsold
= 1701 - 1041
= 660

Answer(s): 660