How to access Enum from another class from the same script

Hello, so currently I'm working on a math game that shows The player 3 equations in which he have to choose the smallest one, the current issue I have now is that I can't seem to access the enum from class EquationData from my ShowEquation() function. I'll give an example of how I did it (search 'This Part'), but it didn't work so I'll need a hand. Thanks in advance.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class Game : MonoBehaviour {
     public EquationData[] Equation = new EquationData[4];
     public Text Equation1;
     public Text Equation2;
     public Text Equation3;
     public bool Turn = true;
     public bool ShowEquation = false;
     public int Timer= 0;
     public int Health = 100;
     public int TurnTime = 50;
     public bool PlayerDamaged = false;
     public int EnemyHitCounter = 0;
 
     // Use this for initialization
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
         Timer += 1;
         if (Timer == TurnTime)
         {
             Turn = !Turn;
             Timer = 0;
         }
 
         //Player's Turn
         if (Turn)
         {
             TurnTime = 300;
             ShowQuestion();
         }
 
         //Enemy's Turn
         if (!Turn)
         {
             TurnTime = 120;
             ShowEquation = false;
             Equation1.text = null;
             Equation2.text = null;
             Equation3.text = null;
             PlayerDamage();
         }
     }
 
     void ShowQuestion()
     {
         if (!ShowEquation)
         {
         EquationData data = Equation[1];
         data.FirstNum= Random.Range(1,20);
         data.SecondNum= Random.Range(1,20);

//This Part

     EquationData.Equationtype = Random(0,3);

     if (EquationData.Equationtype == 0)
     {data.Result = data.FirstNum + data.SecondNum;}

     if (EquationData.Equationtype == 1)
     {data.Result = data.FirstNum - data.SecondNum;}

     if (EquationData.Equationtype == 2)
     {data.Result = data.FirstNum * data.SecondNum;}

     if (EquationData.Equationtype == 3)
     {data.Result = data.FirstNum / data.SecondNum;}

//All the way till here

  Equation1.text = data.FirstNum.ToString() + data.SecondNum.ToString() + data.Result.ToString();
         
         EquationData data2 = Equation[2];
         data2.FirstNum= Random.Range(1,20);
         data2.SecondNum= Random.Range(1,20);
         data2.Result = data2.FirstNum + data2.SecondNum;
         Equation2.text = data2.FirstNum.ToString() + data2.SecondNum.ToString() + data2.Result.ToString();
         
         EquationData data3 = Equation[0];
         data3.FirstNum= Random.Range(1,20);
         data3.SecondNum= Random.Range(1,20);
         data3.Result = data3.FirstNum + data3.SecondNum;
         Equation3.text = data3.FirstNum.ToString() + data3.SecondNum.ToString() + data3.Result.ToString();
         
             ShowEquation = true;
         }
 
 
     }
 
 public void PlayerDamage()
     {
         if(!PlayerDamaged)
         {
             EnemyHitCounter += 1;
             if (EnemyHitCounter == 20)
             {
             Health -= 10;
             EnemyHitCounter = 0;
             PlayerDamaged = true;
             }
         }
     }
 }
     
 
 [System.Serializable]
 public class EquationData
 {
     public float FirstNum;
     public float SecondNum;
     public float Result;
     public Equationtype Equation;
     public enum Equationtype
     {
         Addition,
         Subtraction,
         Multiplication,
         Division
     }
 }