Final answer:
Without knowing the exact amount used by an average station, we cannot provide a precise weight in pounds. The smaller station uses three-quarters of the amount of the average station, so we can use that fraction to estimate if typical usage figures were known.
Step-by-step explanation:
If a smaller than average station uses (3/4) of the amount of scouring powder than an average station uses, then to determine the amount used by the smaller station, we need to know the standard usage by an average station. However, since this information is not provided, we cannot calculate the exact amount. Nevertheless, we can say that if the typical amount used by an average station falls within the range of 20 to 180 pounds, then the smaller station would use three-quarters of that amount. For example, if an average station uses 100 pounds in a week, the smaller station would use 75 pounds (since 3/4 of 100 is 75).