Exam Study Guide: Operational Math

When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to study and prepare for exam questions. Take a look at this sample water treatment licensing question along with an explanation of the correct answer.Sample question:You operate an 18 mgd facility that has six available secondary clarifiers. Your settling tests determine you need three hours settling time in your secondary system. Each clarifier is 18 feet deep with a diameter of 69 feet. How many clarifiers need to be in service to meet the treatment requirement?A. 2 B.