Quantitative Aptitude :: Area - Discussion

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Explanation:
Area of first circle = pi*(x)^2 = pi*x^2
Area of second circle = pi*(2x)^2 = 4*pi*x^2
Area of third circle = pi*(3x)^2 = 9*pi*x^2
Area of fourth circle = pi*(4x)^2 = 16*pi*x^2
Area b/w 1st and 2nd circles = 3*pi*x^2
Area b/w 3rd and 4th circles = 7*pi*x^2
So, Ratio = 3:7