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    The tables after normalization would be:

    Restaurant | Crust

    X Pizza                       |Thick   
    X Pizza                       |Stuffed 
    Papa Pizza                |Thin    
    Papa Pizza                |Stuffed 
    F1 Pizza                     |Thick   
    F1 Pizza                     |Thin    
    

    Restaurant | Delivery Area

    X Pizza                         |Whitefield
    X Pizza                         |Greenville
    X Pizza                         |Capital
    Papa Pizza                  |Capital
    F1 Pizza                       |Whitefield
    F1 Pizza                       |Greenville
    

    So the answer is 6