hi all

i have a question.

now i develop a calculating application by using visualforce.

in a page, i get two random numbers, click "add" button and then add them in a next page.

but i can't keep random numbers in a next page.

how can i keep random numbers in a next page?

now this is code.

「add page(visualforce)」

<apex:page Controller="MathController">
    
          {!RandomNumber1}　＋　{!RandomNumber2}　＝　<br/>

          <apex:form >
               <apex:commandButton value="answer" action="{!Answer}" />
          </apex:form>
                    
</apex:page>

「MathController」

public class MathController {

     public double getRandomNumber1() {

          double ran1 = Math.round(Math.random()*100);
         
          return ran1;
           
     }
    
     public double getRandomNumber2() {

          double ran2 = Math.round(Math.random()*100);
         
          return ran2;
           
     }
 
     public PageReference Answer() {
    
          PageReference secondPage = Page.answer;
    
          secondPage.setRedirect(true);
    
          return secondPage;
    
     }
    
     public double getAddNumber() {

    //this AddNumber method has not been completed.

          double ans = ran1 + ran2;

          return ans;

     }

}

「answer page(visualforce)」

<apex:page Controller="MathController">
    
     The answer is {!AddNumber}.<br/>
    
</apex:page>