JSFiddle - React, Tailwind, and code Playground

HTML

<body></body>

JavaScript

$(function() {
    getQuestion();
});

var count = 0,
    results = [];
function getQuestion() {
    count++;
    var operators = ['+', '-', '/', '*']
    var container = $('<div />');
    var val1 = Math.round(Math.random()*5);
    var val2 = Math.round(Math.random()*5);
    var operator = operators[Math.round(Math.random()*(operators.length - 1))];
    var lbl = $('<label />');
    lbl.html(val1 + ' ' + operator + ' ' + val2 + ' = ');
    container.append(lbl);
    var input = $('<input type="text" />');
    container.append(input);
    var btn = $('<input type="button" value="SVARA" />');
    var val;
    btn.click(function() { 

        results.push({
            number1 : val1,
            number2 : val2,
            answer : input.val()
        });

        input.attr('disabled', true);
        $(this).attr('disabled', true);

        $(this).after(function() {
            if(eval(val1 + operator + val2) == input.val()) return 'RĂ„TT!';
            return 'FEL';
        });

        getQuestion(); 

    });
    container.append(btn);
    $('body').append(container);
}