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Let Kanchan have Rs X with her in the beginning.

     Then   Rs X/2 she is left with after shopping.
        Afterwards 1/3 of (X/2) is spent on rickshaw.
           So (1 - 1/3) rd of (X/2) is what she is left with.

     (2/3) * X/2 is left with her after rickshaw fare. 
            =>   X/3 = Rs 20
     So  she had  Rs 60. with her in the beginning.

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