What is the overall weight of the railway platform, if 20 m3 granite is loaded onto it?

What is the overall weight of the railway platform, if 20 m3 granite is loaded onto it? the initial platform weight is 20 tons. density of granite is 2 600 kg / m3.

ρg = 2600 kg / m ^ 3.
Vg = 20 m ^ 3.
mp = 20 t = 20,000 kg.
m -?
After loading the granite onto the platform, its mass will be determined by the formula: m = mp + mg, where mp is the platform mass, mg is the granite mass.
We find the mass of granite mg by the formula: mg = ρg * Vg, where ρg is the density of granite, Vg is the volume of granite.
mg = 2600 kg / m ^ 3 * 20 m ^ 3 = 52000 kg.
m = 20,000 kg + 52,000 kg = 72,000 kg = 72 t.
Answer: after loading the granite onto the railway platform, its mass will be m = 72 tons.