Sunday Times Teaser 2809 – This and That

by Victor Bryant

Published: 24 July 2016 (link)

I have written down a list of eleven numbers and then consistently replaced digits by letters, with different letters for different digits. In this way the list becomes:

SO  DO  WHAT  NOW  ADD  AND  SEND  IN  THIS  AND  THAT

The grand total of these eleven numbers is a four-figure number.

Numerically, what is THIS + THAT?