title: Sum values of columns into adjacent column
body: <p>How can I add values in columns (T,U,V) and put the result in each adjacent cell in column S?</p>
  
  <p>Example:</p>
  
  <p><a href="https://i.stack.imgur.com/2zmD6.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2zmD6.jpg" alt="sample"></a></p>