How many times can the car transport the sand pile? In fact, it is how many times the weight of the sand pile is the load capacity of the car. Now we only know the load capacity of the car. Let's find the weight of the conical sand pile. From the sentence "sand weight per cubic meter 1.5 tons", we can know: sand pile weight = sand pile volume ×1.5; The volume of the sand pile is unknown, so we can only find the volume first. The sand pile is conical, and its bottom radius is 31.4 ÷ 3.14 ÷ 2 = 5 (m); The bottom area is: 3. 14×5×5=78.5 (square meter); Volume: 78.5× 7.2 ÷ 3 =188.4 (m3); Weight: 188.4× 1.5=282.6 (ton). Given the weight of the sand pile, the number of times the sand pile is transported by car is: 282.6÷5=56.52≈57 (times).
Therefore, the car can transport sand piles in 57 times.