title: Adding numerical strings
body: <p>This bit of code: </p>
  
  <pre><code>var1 = 2
  var2 = '5'    
  puts var1.to_s + var2
  </code></pre>
  
  <p>prints <code>25</code>. I would like to know why. We convert <code>2</code> from an integer to a string <code>2</code>, so in principle, it would be <code>2 + 5 = 7</code>. But why is the output <code>25</code> instead?</p>