She died and left behind a husband, three sons and six daughters
Question

                A woman has died. She had three sons, six daughters and her husband and her parents are deceased. How should the estate be divided among them? The value of the estate is 150,000 riyals.
Praise be to Allah.
      If a woman dies and leaves behind three sons and six 
      daughters, and her husband and father died before her, then the entire 
      estate goes to her children, with each male getting the share of two 
      females. If the estate is 150,000 riyals, then the share of each daughter 
      is 12,500 riyals and the share of each son is 25,000 riyals. 

    If what you mean is that she died and left behind the 
    children mentioned and also left behind a husband, and it is only the 
    parents who are deceased, then the estate is to be divided as follows: 

    The husband gets one quarter, because there are descendants 
    who inherit. 

    The rest goes to the children, with each male getting the 
    share of two females. 

    So the husband's share of the estate is 37,500 riyals. 

    The share of each daughter is 9,375 riyals.

    The share of each son is 18,750 riyals. 

    And Allah knows best.