Wrench A is 12 cm long and wrench B is 24 cm long. How does max torque of wrench A compare to the max torque of wrench B?
torque is measured by multiplying the force applied times the length of the lever arm.torque = F*d, where the force is in Newtons and the length is in meters.
In this case you have one length of 12 cm and a second length of 24 cm. If you apply the same force to both wrenches, then the torque produced by wrench A will be exactly 1/2 the torque produced by wrench B.