639 - Math - Problem Solving

Math - Problem Solving MCQ No. : 23723

Question: Four concentric ( having the same center ) circles with radii, x, 2x, 3x and 4x are drawn to form two rings A and B as shown in the figure.


Ratio of the area of inner ring A to the area of outer ring B is
  1. 1 : 2
  2. 1 : 4
  3. 2 : 3
  4. 3 : 7
  5. None of the above

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Correct Answer: D

Explanation:

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