only (i) is correct
(i) and (ii) are correct
(i) and (iii) are correct
(ii) and (iii) are correct
Concrete
Loose sand
Asphalt
Firm earth
30 kg
300 kg
900 kg
1000 kg
2 kg/tonne
6 kg/tonne
9 kg/tonne
20 kg/tonne
10000 kg
12500 kg
22500 kg
5000 kg