The opera house had 1757 seats. There were 25% fewer $40-seats than $5-seats. 75% of the $5-seats and some $40-seats were sold. A total of $22845 was collected. How many seats were unsold?

	$40	$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 = 1757

1 u = 1757 ÷ 7 = 251

Total number of $5-seat tickets
= 4 u
= 4 x 251
= 1004

Number of $5-seat tickets sold
= 75% x 1004
= ⁷⁵₁₀₀ x 1004
= 753

Amount collected from $5-seat tickets sold
= 753 x 5
= $3765

Amount collected from $40-seat tickets sold
= 22845 - 3765
= $19080

Number of $40-seat tickets sold
= 19080 ÷ 40
= 477

Number of tickets sold
= 753 + 477
= 1230

Number of tickets left unsold
= 1757 - 1230
= 527

Answer(s): 527