You have been hired to design a family-friendly see-saw. Your design will feature a uniform board (mass M = 17 kg, length L = 12 m) that can be moved so that the pivot point is a distance d from the center of the board. This will allow riders to achieve static equilibrium even if they are different masses, as most people are. You have decided that each rider will be positioned so that his/her center of moss will be a distance x offset = 19 cm from the end of the board when seated. You have selected a child of mass m = 29 kg (on the right), and an adult of mass n = 5 times the mass of the child (on the left) to test out your prototype. Part (a) Determine the distance d in m.