Center of Mass problem?

qilint

For the masses m and M, D=3d where c.m. represents the center of mass. If m is doubled, after shifting the center of mass, what is the new ratio D/d?

M...........C.M...................................m

|--------------|---------------------------------------|

<-----d-----> <------------ D------------------->

azlender

The question and diagram are incomprehensible.

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