Скачать или смотреть word problem quadratic equation number of rows and number of seats per row formation and solving

In an auditorium, the sloping floor allows the seas to be arranged to give a clear view of the stage. The seats are arranged in such a way that the number of rows are equal to the number of seats in each row.When the number of rows are doubled and the number of seats in each row is reduced by 16, then the total number of seats increases by 320.(a) If x is taken as the number of rows in the original arrangement, describe the above situation by a quadratic equation.(b) Find the number of rows and hence the total number of seats in the original arrangement.

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