1 t = 1000 kg
1kg = \frac{1}{1000}t=0,001t
1 kg = 100 dag
1dag=\frac{1}{100}kg=0,01kg
1kg=1000g
1g=\frac{1}{1000}kg
---------
30 000 dag =30000*\frac{1}{100}kg=\cdots kg
15 dag jabłko
15 000 g =15000*\frac{1}{1000}kg=\cdots kg
150 000 dag=150000*\frac{1}{100}kg=\cdots kg
4000 g = 4000*\frac{1}{1000}kg=\cdots kg
4000 kg = 4 t (4 tony) słoń