Exams › SSC CGL (Prelims) › General

Two concentric circles have circumferences in the ratio 4 : 7. If the smaller circle has an area of 80 sq m, what is the approximate area of the larger circle?

1. 245 sq m
2. 280 sq m
3. 308 sq m
4. 336 sq m

Correct answer: 245 sq m

Solution

Since circumference is proportional to radius, the radii are in ratio 4:7, and areas in ratio 16:49. Larger area = 80 * (49/16) = 245 sq m.

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