Question

A meterstick is balanced at it's midpoint fulcrum. There are four unknown but identical masses. They are placed at 25cm mark, 45cm mark, and 90 cm mark. Where do you place the 4th to balance the meterstick?

Answer 1

I saw a similar question on here, but the responder included "mg" for mass and gravity in all of the equations leading up to the final one, and then just seemed to forget about them...