title: Excel sum with relative positions
body: <p>How do I sum from whats in B2 to C2 ?</p>
  
  <p>B2 = A10 or just 10 (preferred)<br>
  C2 = A25 or just 25 (preferred)</p>
  
  <p>Normally you would just use SUM(A10:A25), but the values in B2 and C2 are not fixed, they change based on input.
  I can use MATCH to find the numbers, but how do I tell SUM to use those numbers ?
  The values to sum are always in the same column.</p>