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Equation:

Fb = ρgv

Where, Fb = buoyant force

ρ = density of the fluid

g = gravitational acceleration

v = volume of object

We can also write,

Fb = Wa – Wf

Where, Wa = weight of object in air

Wf = weight of object in fluid

So that we have the equation,

ρgv = Wa – Wf

We have given, volume of object = 24 cm^3

Consider density of water as unity.

So, mass = volume x density

= 24 x 1 = 24 g

Therefore, Apparent weight = 50 – 24 = 26 gm.

Mass of substance = 400 gm

Volume of substance = 250 cm^3

So, density = mass/volume = 400/250 = 1.6 gm/cm^3

As the density of substance is more than the density of water. therefore it will sink in the water.

Mass of water displaced by the packet = volume x density

= 250 x 1 = 250 gm.