A massless meter stick sits on a fulcrum at its ... ...

    A massless meter stick sits on a fulcrum at its 0.4-m mark. A 6-kg mass sits on the meter stick at the 0.2-m mark. What mass is required to sit at the 0.9-m mark in order to have torque balance?
(A) 2.4 kg
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 07. Torques and Properties of Solids