On Friday, 170 more women than men attended a concert. On Saturday, the number of women decreased by 10% and the number of men increased by 80%. 1422 audience attended the concert on Saturday. If each ticket cost $18, how much money was collected from the sale of concert tickets on Friday?

	Women		Men
Comparing between the women and the men at first	170 more
Before	10x1	+ 170	5x2
Change	- 1x1	- 17	+ 4x2
After	9x1	+ 153	9x2

	Women		Men
Before	10 u + 170		10 u
Change	- 1 u - 17		+ 8 u
After	9 u + 153		18 u

10% = ¹⁰₁₀₀ = ¹₁₀

80% = ⁸⁰₁₀₀ = ⁴₅

10% x 170
= ¹⁰₁₀₀ x 170
= 17

170 - 17 = 153

Total number of tickets sold on Saturday 
= 9 u + 153 + 18 u
= 27 u + 153 

27 u + 153 = 1422
27 u = 1422 - 153
27 u = 1269

1 u = 1269 ÷ 27 = 47

Total number of tickets sold on Friday
= 10 u + 170 + 10 u 
= 20 u + 170
= 20 x 47 + 153
= 1093

Amount collected from the sale of concert tickets on Friday
= 1093 x 18
= $19674

Answer(s): $19674