Sewage is 99.9% water and 0.02-0.04% (w/v) solids. If a sewage treatment facility processes 12 million gallons a day what mass of solids do they process?

Question

Sewage is 99.9% water and 0.02-0.04% (w/v) solids. If a sewage treatment facility processes 12 million gallons a day what mass of solids do they process? 

Answer 1

12million gallons is the volume of liquid processed:

12million=volume but in this we have 0.02%w/v solid

o.02% of 12million= 2,400weight

to 0.04% of 12million= 4,800weight

thus the answer is 2,400 to 4,800kgs