JSFiddle - React, Tailwind, and code Playground

HTML

<div class="roomnamecta" data-price="1189" data-adult="3">Room 1</div>
<div class="roomnamecta" data-price="578" data-adult="1">Room 2</div>
<div class="roomnamecta" data-price="650" data-adult="2">Room 3</div>
<div class="roomnamecta" data-price="650" data-adult="5">Room 4</div>

JavaScript

$('.roomnamecta').hide();


$('.roomnamecta[data-adult]').filter(function () {
    return $(this).data('adult') >= 3;
}).show();