R_A:R_B=2:5, D_A:D_B=1:6 \\displaystyle g_A:g_B=\\dfrac {\\dfrac {GM_A}{R_A^2}}{\\dfrac {GM_B}{R_B^{2}}}=\\dfrac {4}{3}\\pi \\dfrac {R_A^3D_A}{R_A^2}\ imes \\dfrac {R_B^2}{\\dfrac {4}{3}\\pi R_B^3d_B}=\\dfrac {R_Ad_A}{R_Bd_B} \\dfrac {g_A}{g_B}=\\dfrac {2}{5}\ imes \\dfrac {1}{6}=\\dfrac {1}{15} W_B=mg_B=15mg_A=15W_A For the same volume of planets, mass of planet A is 1/6 the mass of planet B.Planet B has a greater volume than planet A.