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Verified Answer :

faizu

let the unknown number be a ...

87 1/2 % a = 35
=> 175/2/100 a = 35
=> 175/2 1/100 a =35
=> 175/200 a = 35
=> 0.875 a=35
=> a = 35 / 0.875
=> a  = 40
so 87 1/2% of 40 is 35 ..

Hope it helps !!!

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