3. (8 points) A large truck can load 2.5 tons of coal at a time. Now, to transport 48 tons of coal in one go, at least ( ) such large trucks are needed.
A. 18
B. 19
C. 20
D. 21
3. (8 points) A large truck can carry 2.5 tons of coal at a time. Now, 48 tons of coal need to be transported in one go. Therefore, at least ( ) such large trucks are needed.
A. 18
B. 19
C. 20
D. 21
【Solution】Solution: $48 \div 2.5=19.2 \approx 20$ (trucks)
Answer: At least 20 such large trucks are needed.
Therefore, the correct choice is: $C$.