The circumferences of two circles are in the ratio 4:5. If the area of the larger circle is 625 sq. units, find the area of the smaller circle.

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1. Circumference ratio $4:5$ means radii ratio is also $4:5$.
2. Area ratio is square of radii ratio: $(4/5)^2=16/25$.
3. Smaller area = $625	imes\dfrac{16}{25}=400$.

FINAL_ANSWER: a

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