45 trucks, each with 3.5-ton payload, are needed to unload a freight train. How many trucks with a 2.5-ton payload would be needed to do the same job?

The answer is 63 trucks.

Step-by-step explanation:

If we need 45 trucks with 3.5 ton each to do the job; then we have a 157.5 ton payload. So if we divide the 157.5 ton into 2.5 ton trucks we get a total of 63 trucks.

3.5 x 45 = 157.5

2.5 x 63 = 157.5