Hi, I need help solving a problem from the Giancoli Textbook:Chapter 9, Problem

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Hi, I need help solving a problem from the Giancoli Textbook:Chapter 9, Problem 16. However, you need the actual textbook tolook at Figure 9-50 on page 248. Please help. Thank you!

16. Three children are trying to balance on a seesaw, whichconsists of a fulcrum rock, acting as a pivot at the center, and avery light board 3.6m long (Figure 9-50). Two playmates are alreadyon either end. Boy A has a mass of 50kg and girl B a mass of 35 kg.Where should girl C, whose mass is 25 kg, place herself so as tobalance the seesaw?

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