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i like this site!!!!!!!!!

Why not start (a) with Torque equation 245Nd=735N(9-d) and d= distance between child and pivot. Then solve for d is easy. Pivot is 6.75 m away from child. That approach is simpler than what is shown.

Hi kitaya, thanks for the feedback. The technique you describe would be correct, and more efficient, as you say. It's a matter of personal preference, and it's good that you have a technique that works for you.