On Thursday, 510 more men than women attended a concert. On Friday, the number of men decreased by 50% and the number of women increased by 80%. 1106 audience attended the concert on Friday. If each ticket cost $19, how much money was collected from the sale of concert tickets on Thursday?

	Men		Women
Comparing between the men and the women at first	510 more
Before	2x5	+ 510	5x2
Change	- 1x5	- 255	+ 4x2
After	1x5	+ 255	9x2

	Men		Women
Before	10 u + 510		10 u
Change	- 5 u - 255		+ 8 u
After	5 u + 255		18 u

50% = ⁵⁰₁₀₀ = ¹₂

80% = ⁸⁰₁₀₀ = ⁴₅

50% x 510
= ⁵⁰₁₀₀ x 510
= 255

510 - 255 = 255

Total number of tickets sold on Friday 
= 5 u + 255 + 18 u
= 23 u + 255 

23 u + 255 = 1106
23 u = 1106 - 255
23 u = 851

1 u = 851 ÷ 23 = 37

Total number of tickets sold on Thursday
= 10 u + 510 + 10 u 
= 20 u + 510
= 20 x 37 + 255
= 995

Amount collected from the sale of concert tickets on Thursday
= 995 x 19
= $18905

Answer(s): $18905