Math problem in the fourth grade of primary school: five cars can transport 360 tons of goods 12 times, and the existing goods are 540 tons. This pile of goods needs to be transported by the same car nine times.
Hello, Zhang:
Each car can transport at one time:
360 ÷ 5 ÷ 12 = 6 (ton)
9 Shipment of 540 tons of goods requires:
540 9 6 = 10 (vehicle)
Need to add a car:
10-5 = 5 (vehicle)