In order to encourage residents to save water, a city charges tap water users according to the following standards: if the monthly water consumption of each household is not more than 12 tons, the charge is a yuan per ton; if the monthly water consumption is more than 12 tons, the charge is 2A yuan per ton; if the monthly water consumption of a household is 20A yuan, the actual water consumption of the resident in this month______ Tons

In order to encourage residents to save water, a city charges tap water users according to the following standards: if the monthly water consumption of each household is not more than 12 tons, the charge is a yuan per ton; if the monthly water consumption is more than 12 tons, the charge is 2A yuan per ton; if the monthly water consumption of a household is 20A yuan, the actual water consumption of the resident in this month______ Tons

Suppose that the actual water consumption in this month is x tons, according to the meaning of the question: 12a + (X-12) · 2A = 20a, 12 + (X-12) × 2 = 20, the solution is: x = 16