A jack-up 210 feet in length is level during transit. The LCF is 140 feet aft of the bow. How much weight should be applied at the stern to re-level the jack-up if 75 kips is applied at the bow?

Correct Answer: Option D — 150 kips

Longitudinal balance requires balancing moments about the LCF ($w_1 \times d_1 = w_2 \times d_2$). With LCF at 140 feet aft of the bow on a 210-foot vessel, the moment arm ratio requires 150 kips applied at the stern to balance 75 kips at the bow.