Question

the relative density of a substance is 20.3 what is the density in si units if density of water is 1000kg per m3

Answer 1

relative density = density of substance\density of water.
20.3=substance\1000kg\ m cube
20.3*1000=20300kg\ m cube
hope this helps you

Answer 2

relative density= density of the substance/ density of water

 density=20.3 x 1000
           = 20300 kgm-3