Area 8

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Problem: The radii of two circular silver plates of the same thickness are in the ratio 3:4.
If the bigger plate costs $ 656, how much will the smaller plate cost?

Solution: Since, the thickness remains the same, the cost of the plates are proportional to the area of the plates.

The areas of the plates are in the ratio 32: 42

[ since their radii are in the ratio 3: 4]

=> The smaller plate will cost 656 X 9/16 = $ 369

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