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just solve it

This is the puzzel i got it at Google stall in FOSS 2005.

You have a set of five numbers. When adding togather each of the ten possible pairs, you get the
following sums:

0,3,10,13,20,20,23,30,33,40.

what are the five original numbers ?

time - 1 hr
total marks - 10 ( 8-procedure you have adopted + 2 -answer)

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