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

What was the total mass of the railway platform if 20m3 granite was loaded onto it? The initial weight of the platform is 20 tons. The density of granite is 2600kg / m3.

Given:

m = 20 tons = 20,000 kilograms – the initial mass of the railway platform;

V = 20 cubic meters – the volume of granite loaded onto the platform;

ro = 2600 kg / m ^ 3 – density of granite.

It is required to find the mass of the railway platform together with the load m3 (kilogram).

Let’s find a mass of granite that was loaded onto the platform:

m2 = V * ro = 20 * 2600 = 52000 kilograms.

Then the total mass of the railway platform will be equal to:

m3 = m1 + m2 = 20,000 + 52,000 = 72,000 kilograms.

Answer: the total weight of the railway platform is 72,000 kilograms (72 tons).