title: Determine upper and lower bounds given an integer
body: <p>I have a small task within my script that I need to handle and i'm really not sure how I should go about doing it.</p>
  
  <p>The function takes an integer and I need to find upper and lower bounds that the integer lies between.</p>
  
  <p>The upper and lower bounds will always be 5 numbers apart. For example, if the inputted integer is <code>4</code> then the lower bound would be <code>0</code> and the upper bound would be <code>5</code>.</p>
  
  <p>Another example would be if the inputted integer is 26, the lower bound would be <code>25</code> and the upper bound would be <code>30</code>. </p>
  
  <p>Could anyone give me some starting information as to what would be a good way to go about tackling this? I'm thinking that I could just find the lower bound and then add 5 to it in order to find the upper bound? I'm just not entirely certain what would be the most efficient way to find one bound.</p>