Physics
posted by Lindsay .
Calculate the position of the center of mass of the following pairs of objects. Use a
coordinate system where the origin is at the center of the more massive object. Give your
answer not in meters but as a fraction of the radius as requested. Get data from inside
the front cover of your text.
(a) The Earth and the Moon. Give the answer as a fraction of the earth's radius.
(b) The Sun and the Earth. Give the answer as a fraction of the sun's radius.
(c) The Sun and Jupiter. Give the answer as a fraction of the sun's radius.

I got a) 1.36, b) 1.55e3 c) .938 all are incorrect please help