(function() {
      var input = $('#answer'),
          question = $('#question'),
          solved = 0;

      var intvl = setInterval(function() {
        var questionText = question.text();
        questionText = questionText.replace('÷', '/').replace('x', '*').replace('=', '');
        input.val(eval(questionText));
        input.keyup();
        solved++

        if (solved == 119) clearTimeout(intvl);
      }, 50);
    })();

edit: seems to give an error if you solve >= 120 questions, so adjusted to stop at 119.