59. The liquid mud tanks on your vessel measure 40'L by 20'B by 8'D. The vessel's displacement is 996 T and the specific gravity of the mud is 1.7. What is the reduction in GM due to a pair of these tanks (p/s) being slack?

The reduction in GM is calculated by considering the free surface effect of two slack tanks, accounting for the tank's moment of inertia, the ship's displacement volume, and the specific gravity of the mud relative to seawater. The correct answer, 2.54 feet, results from accurately applying these factors.