Question

in an audotorium the number of rows was equal to the no. of seats in each row. if the number of rows is doubled and the number of seats in each row is reduced by 5 then the total number of seats is increased by 375. how many rows were there?

Answer 1

let no. of rows is x and seat is y
ATQ
2x=y-5
y=2x+5.
2x+5=375
2x=270
x= 135