title: How to check if given number is divisible of 15 in fastest way?
body: <p>Division in processor takes much time, so I want to ask how to check in fastest way if number is divisible of some other number, in my case I need to check if number is divisible by 15.</p>
  
  <p>Also I've been looking through web and found <em>fun</em> ways to check if number is divisible of some number, but I'm looking for fast option.</p>
  
  <p><strong>NOTE:</strong> as division takes much time I'm looking for answer without <code>/</code> and <code>%</code>.</p>