Question 4338 Deck General

You are correct, the answer A) 842 ft-long tons is the correct answer. The reasoning is as follows: The initial tank contains 390 tons of ballast at a VCG of 9.85 feet. The vertical moment for this ballast is 390 tons x 9.85 feet = 3,841.5 ft-long tons. After discharging 250 tons of ballast with a VCG of 12.0 feet, the remaining ballast is 390 tons - 250 tons = 140 tons, with a vertical moment of 140 tons x 9.85 feet = 1,379 ft-long tons. The difference between the initial vertical moment and the remaining vertical moment is 3,841.5 ft-long tons - 1,379 ft-long tons = 842 ft-long tons, which matches the correct answer A. The other options are incorrect because they do not accurately represent the change in vertical moment after the ballast discharge.