Updating Button Text

Hello everyone I have a problem with my code. The button's text updates for two out of three of them, but when I click the one that is the right answer it never updates to the new answer.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class Calculator : MonoBehaviour { public int requestedfinal, RandomAnswer1, RandomAnswer2; public string[] Answers; public int firstvalue, secondvalue, timevalue; public Text[] Guesses; public Text first, Operator, second, answer; string[] Operations = {"Add", "Subtract", "Multiplication", "Division" }; string chosenOperation; // Start is called before the first frame update void Start() {

 }

 // Update is called once per frame
 void Update()
 {
     if (Input.GetKeyDown(KeyCode.S))
     {

         ACalculator("Add");

     }
     if (Input.GetKeyDown(KeyCode.D))
     {

         ACalculator("Subtract");

     }
     if (Input.GetKeyDown(KeyCode.F))
     {

         ACalculator("Multiplication");

     }
     if (Input.GetKeyDown(KeyCode.G))
     {

         ACalculator("Division");

     }
     Answers[0] = "" + requestedfinal;
     Guesses[0].text = Answers[0];
     Answers[1] = "" + RandomAnswer2;
     Guesses[1].text = Answers[1];
     Answers[2] = "" + RandomAnswer1;
     Guesses[2].text = Answers[2];
 }

 public void ACalculator(string operation)
 {
  

     secondvalue = Random.Range(1, 10);
     firstvalue = Random.Range(1, 10);
  
      if (firstvalue- secondvalue < 0)
      {

          timevalue = secondvalue;
          secondvalue = firstvalue;
          firstvalue = timevalue;
      } 

      if(operation == "Add")
     {

         requestedfinal = firstvalue + secondvalue;
         Operator.text = "+";
       
     }
     if (operation == "Subtract")
     {

         requestedfinal = firstvalue - secondvalue;
         Operator.text = "-";
        
     }
     if (operation == "Multiplication")
     {

         requestedfinal = firstvalue * secondvalue;
         Operator.text = "*";
       
     }
     if (operation == "Division")
     {

         requestedfinal = firstvalue / secondvalue;
         Operator.text = "/";
         
     }
     /*
     for (int i = 0; i < Guesses.Length; i++)
     {
         i = Random.Range(0, 2);
         Answers[Random.Range(0, 2)] = Guesses[i].text;

     }
     Answers[0] = " " + RandomAnswer1;
     Answers[1] = " " + RandomAnswer2;
     Answers[2] = " " + requestedfinal;
     Guesses[0].text = " " + Answers[0];
     Guesses[1].text = " " + Answers[1];
     Guesses[2].text = " " + Answers[2];
     */
     first.text = "" + firstvalue;
     second.text = "" + secondvalue;
     RandomAnswer1 = requestedfinal + Random.Range(1, 3);
     RandomAnswer2 = requestedfinal + Random.Range(-1, -3);
     
     Answers[0] ="" + requestedfinal;
     Guesses[0].text = Answers[0];
     Answers[1] = "" + RandomAnswer2;
     Guesses[1].text = Answers[1];
     Answers[2] = "" + RandomAnswer1;
     Guesses[2].text = Answers[2];
    
     Debug.Log(RandomAnswer1 +"  "+ RandomAnswer2 );
     Debug.Log("1Value: " + firstvalue + " 2Value: " + secondvalue + " Requested Value: " + requestedfinal);

 }
 public void Guess1()
 {

     answer.text = Guesses[0].text;

     if (answer.text == "" + requestedfinal)
     {
         StartCoroutine("Right");
     }

 }
 public void Guess2()
 {
     answer.text = Guesses[1].text;

     if (answer.text == "" + requestedfinal)
     {
         StartCoroutine("Right");
     }
 }
 public void Guess3()
 {

     answer.text = Guesses[2].text;
     if (answer.text == "" + requestedfinal)
     {
         StartCoroutine("Right");
     }

 }
 IEnumerator Right()
 {
     yield return new WaitForSeconds(1);

     int i = Random.Range(0, 3);
     int chosen = Random.Range(0, Operations.Length);
     ACalculator("" + chosen);
     if (chosen == 0)
     {

         Operator.text = "+";

     }
     if (chosen == 1)
     {

         Operator.text = "-";

     }
     if (chosen == 2)
     {

         Operator.text = "*";

     }
     if (chosen == 3)
     {

         Operator.text = "/";

     }

     answer.text = "?";
 }

}