<?php

class Calculator
{
 public function add(...$numbers)
 {
       $total = 0;
        foreach($numbers as $number){
            if(is_numeric($number)){
               $total += $number;
            }else{
                throw new Exception ("All the number must be numeric")
            }
        }
  return $total;
 }

 public function divide($a, $b)
 {
  $total = 0;
        if(is_numeric($a) && is_numeric($b)){
          $total = $a / $b;
        }else{
          throw new Exception ("All the number must be numeric")
        }
      
  return $total;
 }
}