What was the average dose in mg/L for alum fed on a five-day period with amounts of 1,150 lbs, 1,200 lbs, 1,175 lbs, 1,250 lbs, and 1,225 lbs, if 8 million gallons were treated each day?

To determine the average dose of alum in mg/L over the five-day period, one must first calculate the total amount of alum fed during those five days and then convert that into a concentration based on the total volume of water treated.

The amounts of alum fed each day are as follows: 1,150 lbs, 1,200 lbs, 1,175 lbs, 1,250 lbs, and 1,225 lbs. First, summing these amounts gives:

1,150 + 1,200 + 1,175 + 1,250 + 1,225 = 6,000 lbs

Next, this total weight must be converted to milligrams since the final concentration we want is in mg/L. There are 453,592 mg in a pound, so we multiply the total weight by this conversion factor:

6,000 lbs * 453,592 mg/lb = 2,721,552,000 mg

Now, since the alum was fed over a five-day period, it was used in a total volume of water each day. The total volume treated over those five days is:

8 million gallons/day * 5 days = 40 million gallons

To convert gallons to liters (as