When a body is immersed in a liquid, in addition to gravitational force, buoyant force due to the liquid also acts on the body in the upward direction. As a result, the resultant weight of the liquid reduces and is given the difference of actual weight and buoyant force.
Volume of concrete = Mass/density
Buoyant force on the block, where is density of liquid, V is volume of solid, g is acceleration due to gravity.
New weight, W = Actual weight - buoyant force
Option B is correct.
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