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by sujaysolanki » Sun Nov 25, 2007 8:36 am
Nice one took me some time to figure out :)

A5 = 99 A3 = 27

A5 = 2a4 - x
A4 = 2a3 - x

A5 = 2a4 - x
= 2 (2a3 - x) -x

NOw we know a5 = 99 and a3 = 27 ..Hence X on sloving comes to 3
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