On which day did the system use more than 4,000 gallons of water?

The answer indicates that Monday is the day when the water system used more than 4,000 gallons. To understand why this choice is correct, it’s important to consider factors such as typical water usage patterns.

Water usage can fluctuate based on daily activities and demands, often peaking after weekends when people return to their regular routines. It is common for systems to see higher water usage on Mondays as residents often resume activities such as watering lawns, filling swimming pools, or carrying out chores that require more water after the weekend.

In this case, if Monday recorded water usage exceeding 4,000 gallons, this aligns with expected trends where the day following the weekend may show an increase in consumption. Other days, like Sunday or Wednesday, may not match this spike in usage due to lower demands, or they may not have that specific record of usage surpassing the significant threshold of 4,000 gallons.