title: How to find ratio between two columns in a dataframe?
body: <p>For example</p>
  
  <pre><code>df
  
  Cars             Male   female
  Ford focus        23      64
  vw golf           76      12
  ford ka           34      55
  renault megane    12      83
  </code></pre>
  
  <p>How do i find the ratio of male to female for every car >0.5</p>