At a concert hall, each adult ticket cost $24 and each child ticket cost $14. On Tuesday, the number of adult tickets sold was 70 less than the number of child tickets. On Wednesday, the number of adult tickets sold decreased by 35% while the number of child tickets sold increased by 40%. If a total of 1123 tickets were sold on Wednesday, how much money was collected on Tuesday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 70	2 u + 70
Change	- 0.35 u	+ 0.4 u + 28
After	0.65 u	1.4 u + 98	2.05 u + 98

35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 70 = ⁴⁰₁₀₀ x 70 = 28

Number of tickets sold on Wednesday
= 0.65 u + 1.4 u + 98
= 2.05 u + 98

2.05 u + 98 = 1123
2.05 u = 1123 - 98
2.05 u = 1025

1 u = 1025 ÷ 2.05 = 500

Amount collected from adult tickets on Tuesday
= 1 u x 24
= 500 x 24
= $12000

Amount collected from child tickets on Tuesday
= 14(1 u + 70)
= 14(500 + 70)
= 14 x 570
= $7980

Total amount collected on Tuesday
= 12000 + 7980
= $19980

Answer(s):$19980