public function getMathsQuestion()
    {
        /** @var Session $session */
        $session = Controller::curr()->getRequest()->getSession();

        if (!$session->get("mathQuestionV1") && !$session->get("mathQuestionV2")) {
            $v1 = rand(1, 9);
            $v2 = rand(1, 9);

            $session->set("mathQuestionV1", $v1);
            $session->set("mathQuestionV2", $v2);
        } else {
            $v1 = $session->get("mathQuestionV1");
            $v2 = $session->get("mathQuestionV2");
        }

        return sprintf(
            _t('MathSpamProtection.WHATIS', "What is %s plus %s?"),
            MathSpamProtectorField::digit_to_word($v1),
            MathSpamProtectorField::digit_to_word($v2)
        );
    }