On Wednesday, 390 more women than men attended a concert. On Thursday, the number of women decreased by 50% and the number of men increased by 70%. 877 audience attended the concert on Thursday. If each ticket cost $15, how much money was collected from the sale of concert tickets to all the men?

	Women		Men
Comparing between the women and the men at first	390 more
Before	2x5	+ 390	10x1
Change	- 1x5	- 195	+ 7x1
After	1x5	+ 195	17x1

	Women		Men
Before	10 u + 390		10 u
Change	- 5 u - 195		+ 7 u
After	5 u + 195		17 u

50% = ⁵⁰₁₀₀ = ¹₂

70% = ⁷⁰₁₀₀ = ⁷₁₀

50% x 390
= ⁵⁰₁₀₀ x 390
= 195

390 - 195 = 195

Total number of tickets sold on Thursday 
= 5 u + 195 + 17 u
= 22 u + 195 

22 u + 195 = 877
22 u = 877 - 195
22 u = 682

1 u = 682 ÷ 22 = 31

Total number of tickets sold to all the men
= 10 u + 17 u
= 27 u 
= 27 x 31
= 837

Amount collected from the sale of concert tickets to all the men
= 837 x 15
= $12555

Answer(s): $12555