What was the total mass of the railway platform if 20 m³ granite was loaded onto it?

Initial data: V (volume of granite, which was loaded onto the platform) = 20 m ^ 3; m1 (initial weight of the railway platform) = 20 tons.

Reference data: according to the condition ρ (density of granite) = 2600 kg / m ^ 3.

1) Calculate the mass of granite, which was loaded onto the railway platform: m2 = ρ * V = 2600 * 20 = 52,000 kg = 52 tons.

2) Determine the mass of the platform after loading the granite: m = m1 + m2 = 20 + 52 = 72 tons.

Answer: The total mass of the railway platform has become equal to 72 tons.