At a museum, each adult ticket cost $24 and each child ticket cost $15. On Monday, the number of adult tickets sold was 60 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 40% while the number of child tickets sold increased by 25%. If a total of 1555 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 60	2 u + 60
Change	- 0.4 u	+ 0.25 u + 15
After	0.6 u	1.25 u + 75	1.85 u + 75

40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u 
25% x 1 u = ²⁵₁₀₀ x 1 u = 0.25 u
25% x 60 = ²⁵₁₀₀ x 60 = 15

Number of tickets sold on Tuesday
= 0.6 u + 1.25 u + 75
= 1.85 u + 75

1.85 u + 75 = 1555
1.85 u = 1555 - 75
1.85 u = 1480

1 u = 1480 ÷ 1.85 = 800

Amount collected from adult tickets on Monday
= 1 u x 24
= 800 x 24
= $19200

Amount collected from child tickets on Monday
= 15(1 u + 60)
= 15(800 + 60)
= 15 x 860
= $12900

Total amount collected on Monday
= 19200 + 12900
= $32100

Answer(s):$32100