On Monday, 450 more men than women attended a concert. On Tuesday, the number of men decreased by 40% and the number of women increased by 70%. 1259 audience attended the concert on Tuesday. If each ticket cost $15, how much money was collected from the sale of concert tickets for the two days?

	Men		Women
Comparing between the men and the women at first	450 more
Before	5x2	+ 450	10x1
Change	- 2x2	- 180	+ 7x1
After	3x2	+ 270	17x1

	Men		Women
Before	10 u + 450		10 u
Change	- 4 u - 180		+ 7 u
After	6 u + 270		17 u

40% = ⁴⁰₁₀₀ = ²₅

70% = ⁷⁰₁₀₀ = ⁷₁₀

40% x 450
= ⁴⁰₁₀₀ x 450
= 180

450 - 180 = 270

Total number of tickets sold on Tuesday 
= 6 u + 270 + 17 u
= 23 u + 270 

23 u + 270 = 1259
23 u = 1259 - 270
23 u = 989

1 u = 989 ÷ 23 = 43

Total number of tickets sold for the two days
= (10 u + 450) + 10 u + (6 u + 270) + 17 u
= 43 u + 720
= 43 x 43 + 720
= 2569

Amount collected from the sale of concert tickets for the two days
= 2569 x 15
= $38535

Answer(s): $38535