Penny Coin

A penny coin lies on a table at a distance of 18.2 cm from a stack of three Penny Coins.?

Consider the stack of pennies to be the origin. Where is the center of mass of the system of four coins?

sounds like homework. sorry I don't cheat for any one.

if you want to answer this just look at wikipedia http://en.wikipedia.org/wiki/Center_of_mass

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