Final answer:
Tank A holds 227,367 gallons less water than Tank B, which we find by subtracting Tank A's volume from Tank B's volume.
Step-by-step explanation:
To calculate how much less water Tank A holds than Tank B, we need to subtract the volume of Tank A from the volume of Tank B. The given volumes are 678,500 gallons for Tank A and 905,867 gallons for Tank B.
The difference in volume is:
905,867 gallons (Tank B) - 678,500 gallons (Tank A) = 227,367 gallons.
Therefore, Tank A holds 227,367 gallons less water than Tank B.