Riddle: 40 Pound Weight?

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Another riddle:

A man loans his friend his only 40 pound weight to weight grain on a balance scale. A week later the friend brings back the weight broken into 4 pieces. However, the man is happier now, because he can now measure anything weighing 1 to 40 lbs. (Note: the measured weights are in whole numbers. So he cannot measure 1.5 pounds.) What are the weights of each piece?
if m right..its 1 , 3, 9 and 27

cheers

SS
that doesnt sound right to me, I only say that because that combination would not allow you to weigh against an object that was two pounds.
Students: We have free audio pronunciation exercises.
yes it would... add a 3 pound weight to one side.. the one pound weight to the other... then add whatever your weighing with the one pound weight... when it balances the item your weighing is two pounds...

~Dan
1, 3, 9, and 27 is the only answer that works.

Some other answers are posted online... but no NOT work:
1, 9, 10, and 20... you cannot get 3
1, 2, 8, and 29... you cannot get get 4
7, 8, 10, and 15... you cannot get 19
and
5, 7, 8, and 20... you cannot get 9

BTW a 121 pound weight broken into 5 pieces will give you every integer up to 121.
You'll need 1, 3, 9, 27, and 81