The theatre had 889 seats. There were 25% fewer $50-seats than $15-seats. 50% of the $15-seats and some $50-seats were sold. A total of $25010 was collected. How many seats were unsold?

	$50	$15	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 = 889

1 u = 889 ÷ 7 = 127

Total number of $15-seat tickets
= 4 u
= 4 x 127
= 508

Number of $15-seat tickets sold
= 50% x 508
= ⁵⁰₁₀₀ x 508
= 254

Amount collected from $15-seat tickets sold
= 254 x 15
= $3810

Amount collected from $50-seat tickets sold
= 25010 - 3810
= $21200

Number of $50-seat tickets sold
= 21200 ÷ 50
= 424

Number of tickets sold
= 254 + 424
= 678

Number of tickets left unsold
= 889 - 678
= 211

Answer(s): 211