Density of nuclear matter is independent of mass number, so the required ratio is 1:1. Alternative : A1:A2=1:3 Their radii will be in the ratio R0A11/3:R0A21/3=1:31/3 Density =34πR3A∴ρA1:ρA2=34πR03⋅131:34πR03(31/3)33 Their nuclear densities will be the same.