At a museum, each adult ticket cost $40 and each child ticket cost $16. On Wednesday, the number of adult tickets sold was 100 less than the number of child tickets. On Thursday, the number of adult tickets sold decreased by 35% while the number of child tickets sold increased by 40%. If a total of 755 tickets were sold on Thursday, how much money was collected on Wednesday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 100	2 u + 100
Change	- 0.35 u	+ 0.4 u + 40
After	0.65 u	1.4 u + 140	2.05 u + 140

35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 100 = ⁴⁰₁₀₀ x 100 = 40

Number of tickets sold on Thursday
= 0.65 u + 1.4 u + 140
= 2.05 u + 140

2.05 u + 140 = 755
2.05 u = 755 - 140
2.05 u = 615

1 u = 615 ÷ 2.05 = 300

Amount collected from adult tickets on Wednesday
= 1 u x 40
= 300 x 40
= $12000

Amount collected from child tickets on Wednesday
= 16(1 u + 100)
= 16(300 + 100)
= 16 x 400
= $6400

Total amount collected on Wednesday
= 12000 + 6400
= $18400

Answer(s):$18400