At a bird park, each adult ticket cost $38 and each child ticket cost $8. On Monday, the number of adult tickets sold was 105 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 50% while the number of child tickets sold increased by 40%. If a total of 337 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 105	2 u + 105
Change	- 0.5 u	+ 0.4 u + 42
After	0.5 u	1.4 u + 147	1.9 u + 147

50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 105 = ⁴⁰₁₀₀ x 105 = 42

Number of tickets sold on Tuesday
= 0.5 u + 1.4 u + 147
= 1.9 u + 147

1.9 u + 147 = 337
1.9 u = 337 - 147
1.9 u = 190

1 u = 190 ÷ 1.9 = 100

Amount collected from adult tickets on Monday
= 1 u x 38
= 100 x 38
= $3800

Amount collected from child tickets on Monday
= 8(1 u + 105)
= 8(100 + 105)
= 8 x 205
= $1640

Total amount collected on Monday
= 3800 + 1640
= $5440

Answer(s):$5440