Question 359476
let rows be x
chairs = 2x-2
..
x(2x-2)=144
2x^2-2x=144
x^2-x-72=0
x^2-9x+8x-72=0
x(x-9)+8(x-9)=0
(x-9)(x+8)=0
rows are 9 
chairs = 2x-2 = 18-2 = 16
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