Question 157443
Note that 
1 lb = 454g
1 ft = 30.48cm
So
1 g = {{{(1/454) lb }}}
1 cm = {{{(1/30.48)ft}}}
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{{{14.7(g/cm^3)}}}
={{{14.7*((1g)/((1cm)^3))}}}
={{{14.7*(((1/454)lb)/(((1/30.48)ft)^3))}}}
={{{14.7*((1/454)/((1/30.48)^3))((lb)/ft^3)}}}
={{{((14.7*30.48^3)/454)((lb)/ft^3)}}}
={{{916.9((lb)/ft^3)}}}