Mathematics, 10.02.2020 20:03 josephfoxworth

There are 450 seats in the lower level of a concert hall with b balcony seats in the upper level. So far, 170 tickets have been sold, which is 1/5 if the total number of seats in the concert hall. How many balcony seats are in the concert hall?

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There are 450 seats in the lower level of a concert hall with b balcony seats in the upper level. So...