A 24-inch-gun battleship approaches 160,000 tons

How large would a 30-knot battleship need to be with twelve 24-inch guns and armour against 19-inch shells?

A rapid live estimate puts the design near 160,000 tons, with a proper answer requiring several hours of textbook-based calculation.

The hypothetical ship carries four triple 24-inch turrets, armour intended to stop 19-inch shells at battle ranges, and machinery for 30 knots. The immediate estimate is about 160,000 tons. That figure comes from a rapid mental calculation. A worked answer would require time with naval-design textbooks, so the estimate indicates scale without settling the design's displacement.