A wrench with a length of #24 cm# is being used to unscrew a #3 cm# bolt. If a torque of #88 Nm# is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?
You must apply a minimum torque of 88 Nm to loosen the bolt. That is given in the question. To fully remove the bolt after loosening it, will require some lesser, but unknown, amount of torque. That amount of torque can not be determined from the given data.
I hope this helps,