How much water is in flushing the toilet 20 times?

The amount of water used in flushing a toilet varies depending on the model. Standard toilets typically use about 1.6 gallons per flush, while older models may use up to 3.5 to 7 gallons per flush. Therefore, flushing a toilet 20 times would use approximately 32 gallons for a standard toilet and potentially up to 140 gallons for an older model.