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The diameters of 3 different circles, which have a common

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The diameters of 3 different circles, which have a common [#permalink]  06 May 2006, 03:06
The diameters of 3 different circles, which have a common centre, are 8, 20, and 40 respectively. The region between the little circle and the middle circle is shaded. The area of the shaded region is what fraction of the big circle?
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getzgetzu, it's good that you post all those QS

Area of little-16pi
area of middle-100pi
area of big-400pi
Ratio required 84pi/400pi=21/100
Regards
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