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Thanks Scale

1- With 5 kg and 9 kg weights in different pans, weigh 4 kg.
2- With 4 kg weigh a second 4 kg
3- Now weigh a third 4 kg
4- Weigh a fourth 4 kg
5- Weigh a fifth 4 kg
6- You now have 5 x 4 kg = 20 kg
7- Divide equally each portion of 4 kg on the two sides of
     the scale to obtain 2 kg weights.
8- Bag 'em...Dano!

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