On Monday, 550 more women than men attended a concert. On Tuesday, the number of women decreased by 40% and the number of men increased by 50%. 666 audience attended the concert on Tuesday. If each ticket cost $18, how much money was collected from the sale of concert tickets for the two days?

	Women		Men
Comparing between the women and the men at first	550 more
Before	5x2	+ 550	2x5
Change	- 2x2	- 220	+ 1x5
After	3x2	+ 330	3x5

	Women		Men
Before	10 u + 550		10 u
Change	- 4 u - 220		+ 5 u
After	6 u + 330		15 u

40% = ⁴⁰₁₀₀ = ²₅

50% = ⁵⁰₁₀₀ = ¹₂

40% x 550
= ⁴⁰₁₀₀ x 550
= 220

550 - 220 = 330

Total number of tickets sold on Tuesday 
= 6 u + 330 + 15 u
= 21 u + 330 

21 u + 330 = 666
21 u = 666 - 330
21 u = 336

1 u = 336 ÷ 21 = 16

Total number of tickets sold for the two days
= (10 u + 550) + 10 u + (6 u + 330) + 15 u
= 41 u + 880
= 41 x 16 + 880
= 1536

Amount collected from the sale of concert tickets for the two days
= 1536 x 18
= $27648

Answer(s): $27648