The mass of coal in a railway carriage is 60 tons. The dump truck can take a third of this cargo.

The mass of coal in a railway carriage is 60 tons. The dump truck can take a third of this cargo. How many trips do you need to make on a dump truck to unload 6 such wagons?

1 carriage – 60 tons.
1 dump truck contains 1/3 of the load.
How many runs of a dump truck do you need to unload 6 wagons?
1) 60 * 1/3 = 20 (t) in 1 dump truck.
2) 60/20 = 3 (r.) Unload 1 wagon.
3) 3 * 6 = 18 (p.) To unload 6 wagons.
To unload 6 wagons, 18 dump truck runs are needed.