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Here when you say  total money, it means the amount of money she has at that moment.

 let the amount she started with  be  S.

   S/2  on groceries.    left with :  S/2
   1/3 rd of it  on  transport:  so S/6.      She is left with  S/2 - S/6 = S/3
   she spent  1/4th of that remaining in  a gutter.
             So that is:  S/12.        She is left with  S/3 - S/12 = S/4

   So then  S/4 = $15

         She started with  a sum of $60.

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