Word Problems Solver C#

i need a software for solving word problems programmetically, for example if i give a problem to that software e. g "The sum of two numbers is 16. The difference is 4. What are the two numbers?" first we goto that software and define know and unknown quantities in software like : first number = X                        //first quantity 2nd number = Y                        //2nd quantity sum of two numbers =  16     //3rd quantity diff. of two numbers = 4        //4th quantity and my software autometically generates two equations for me like X + Y = 16 Y - X  = 4 and then my software solve these equations using creamer rule. when we define quantity it can be simple value, unknow quantity or can be any mathmetical expression. i attached the document(data base of word problm) its contains a lot of many problems for testing software.