The mass of coal in a railway carriage is 60 tons. A dump truck can take three-tenths of this cargo.

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

To solve this problem, remember that in order to find a part of a number, you need to multiply this number by a part. Let’s calculate how much coal a dump truck can take in one trip.

3/10 * 60 = 6 * 3 = 18 tons.

Let’s calculate how much coal is in 6 cars, knowing that there is 60 tons in one.

60 * 6 = 360 tons.

Let’s calculate how many trips need to be done on a dump truck to unload 6 such wagons.

360/18 = 20 flights.

Answer: 20 flights.