Adding Two Quries

Hi. I can use two qureis like below

select A,B,C from ABC

union

 select D,E,F from DEF

now my requirement is

i need sum of these values in single query.

 

TWo queries are from two different and no linlk between ABC and DEF..

but i need sum

Eg. if 1st qry gives 1,2,3

2nd give 4,5,6  by union i get it like

1,2,3

4,5,6

 

 but wat i need is 5,7,9 .Can u???