Using * ngFor with ng container and * ngIf

One section of my form contains a set of n radio buttons (here we will set n = 3), which appear in the template as:

<input type="radio" name="variety" value="11" (click)="update($event)">SomeNameX
<input type="radio" name="variety" value="23" (click)="update($event)">SomeNameY
<input type="radio" name="variety" value="36" (click)="update($event)">SomeNameZ

      

        
        
        
      

    

Below the radio buttons, I want to create one of them when the corresponding SomeName is selected:

<div *ngIf="selected===11">Last updated: Sept 1</div>
<div *ngIf="selected===23">Last updated: Oct 3</div>
<div *ngIf="selected===36">Last updated: Nov 4</div> 

      

        
        
        
      

    

where the date and value for each SomeName is returned from the database. I use the following code to make this work:

  <ng-container *ngFor="let item of items;">
  <div         
    *ngIf="selected==={{item.id}}"
    >Last updated:  {{item.dte}}</div>
  </ng-container>

      

        
        
        
      

    

It doesn't work because of the {{item.id}} element - how can I enter the correct value / id at this position?

Thanks / Tom.