A group of friends on a hike get tired and decide to ride a perfectly uniform 5-m log down a river to help them get closer to their starting point. Paige whose mass is 40-Kg sits a half meter from the front and Kenny at 60-Kg sits a quarter of a meter from the back. Finally, Ed estimates the log’s mass to be 1,000-Kg and knows that he should sit 3-m from the back in order to keep the Center of  Mass exactly in the middle of the log for a smoother ride. What is Ed’s mass?

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