Question

An average family of four uses roughly 1200 Liters of water per day (1L. - 1000 cm3). A lake that covers 50 km² with a uniform depth and

supplies water to a local town with a population of 40,000 people would lose depth every year due to water consumption form
the locals, Ignore evaporation, rain, creeks and rivers.

Answer 1

#_total = 4.38 10⁹ liter

Step-by-step explanation:

For this exercise we can use a direct proportion rule (rule of three). If 4 people use 1200 liters how much water 1 person consumes

#_water = 1 person (1200 liter / 4 person)

#water = 300 liters

Now we look for the consumption of this person in a year, if 1 person consumes 300 liters 1 day, how many liters they consume in a year (365 days)

#_water_person_total = 365 days (300 liters / 1 day)

#_water_person_total = 109500 liters

This is the water consumption of 1 person in a year, the total of 40000 people how much they consume

#_total = 40000 person (109500 liter / 1 person)

#_total = 4.38 10⁹ liter