JSFiddle - React, Tailwind, and code Playground

HTML

<table width="100%">
    <tr>
        <td style="width:100px;" class="fixCol">ID Region</td>
        <td style="width:120px;"  class="fixCol">Data</td>
        <td class="Col">Col1</td>
        <td class="Col">New Column</td>
        <td class="Col">Another Column</td>
    </tr>
</table>

JavaScript

$(document).ready(function(){
var tableWidth = $("table").width();
var colCount = $("table td.Col").size();

// gett fixed td Width
fixCol = 0;
$.each($("table td.fixCol"), function(){
    fixCol += $(this).width();    
});

//set remainging td width
var tdWidth = (tableWidth-fixCol)/colCount;


$("table .Col").css('width',tdWidth);
});