JSFiddle - React, Tailwind, and code Playground

HTML

<p>Condition: A / B = C</p>

<form name="divide">
    <label>A: </label><input type="text" name="a" value="0">
    <label>B: </label><input type="text" name="b" value="0">
    <label>C: </label><input type="text" name="c" value="0">
</form>

JavaScript

document.divide.onclick = document.divide.onkeyup = function(){
    this.c.value = this.a.value / this.b.value;
};