public static void main (String args[]) {
        
       int number1 = (int)(Math.random() *10);
       int number2 = (int)(Math.random() *10);
	Scanner input = new Scanner(System.in);
        System.out.print("what is " + number1 + "+" + number2 + "?");
        int answer = input.nextInt();
        
        while(number1 + number2 != answer)
        {
            System.out.print("Wrong answer. Try again. What is " + number1 + "+" + number2 + "?");
            answer= input.nextInt();
        }
        System.out.println("You got it.");
}