using NCalc;

using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        var expressions = new[]

        {

            "30.166666666666666666666666667",

        };

        foreach (string expression in expressions)

        {

            Expression myExpr = new Expression(expression);

            if (expression.Contains("[A]"))

            {

                myExpr.Parameters["A"] = "I am running";

            }

            if (expression.Contains("[B]"))

            {

                myExpr.Parameters["B"] = " along the road";                    

            }

            if (expression.Contains("[X]"))

            {

                myExpr.Parameters["X"] = 7;                    

            }

            if (expression.Contains("[Y]"))

            {

                myExpr.Parameters["Y"] = 0;                    

            }

            System.Console.WriteLine(expression + " => " + myExpr.Evaluate());

            if (myExpr.Parameters.Count > 0)

            {

                foreach (var myExprParameter in myExpr.Parameters)

                {

                    Console.WriteLine("Parameter " + myExprParameter.Key +" => " + myExprParameter.Value.ToString());

                }

            }

        }

    }

}