Definitely 20000 kg
you can hold 20 g in your hand
However,
20,000 kg = 20 tonnes (metric tons). You will need a crane to lift that lot.
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1 kg = 1000 g
20000 kg is considerably larger than 20 g (1,000,000 times larger).
It is: 1500 g which is 1.5 kg
8.1 kg
4 kg is big, because 1000 g is 1
Neither.
1000 g = 1 kg 1000/20 = 50 50 x 20 g = 1 kg