a concert hall has 4000 seats. these seats are divided into section A

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a concert hall has 4000 seats. these seats are divided into section A and B. the cost of a ticket in section A Is $50 and that of section B is $40. assuming that all the seats are occupied determine the number of seats to be allocated to each section so as to get daily revenue of $ 180,000. (use gaussian method)

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a+b = 4000
50a+40b = 180000
a = b = 2000

a=2000, b=2000

Please show your steps clearly

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