1.3.    

   A + B = C,  A, B  C -   
,         
 (?).     ?2+34=4?.  
     ,     
,  ,   .     
 .

 
       . 
    80 .     .

 
      ,   
     ,   
"No solution".

  
??2?4+9?=355

  
00264+91=355
