An electric clothes dryer uses approximately \(5\) kilowatt-hours of energy to dry a single load of laundry.
On average, Mary Lois’s family washes \(4\) loads of laundry per week. If they use a clothes line instead of the electric dryer to dry half of their loads of laundry, approximately how many kilowatt-hours of energy will they save in a year?
Themes: Number Sense, Geometry & Measurement