🔍 Key Concepts

• Use the white pages tank tables for SS AMERICAN MARINER to get the LCG-FP (in feet) for each listed tank at the exact load in tons shown in the question. • Remember that total LCG of a group of weights is found from the sum of longitudinal moments divided by the sum of the weights. • Port and starboard tanks with the same name (e.g., DB 4 P and DB 4 S) have the same LCG-FP, so their weights can be combined before finding the moment.

💭 Think About

• For each tank in the list, what two numbers do you need from the Stability Data Reference Book white pages so you can calculate that tank’s longitudinal moment about the FP? • Once you have the total weight of all liquids and the sum of their longitudinal moments, how do you convert that into a single LCG-FP for the entire liquid load? • How can combining symmetrical port and starboard tanks help simplify your arithmetic while keeping their common LCG-FP unchanged?

✅ Before You Answer

• For every tank listed (including DIS/WATER), verify you have the correct weight in tons and LCG-FP in feet from the white pages before starting any calculations. • Be sure all moments are computed as weight × LCG-FP about the forward perpendicular, and that you are using consistent units (tons and feet). • After computing the final LCG-FP (total moment ÷ total weight), compare it to the choices and check that it falls within the range of the individual tank LCGs you used—if it doesn’t, re-check your arithmetic.