Explanation:

- To find the number of males and females in each town, let's first break down the given information.

- Town A:

- Ratio: 7 males to 13 females.

- If the difference is 15,000, then:

- Let the number of males be 7x and females be 13x.

- Equation: 13x - 7x = 15,000, solving for x gives x = 2,500.

- Males = 7 * 2,500 = 17,500; Females = 13 * 2,500 = 32,500.

- Town B:

- Ratio: 6 males to 1 female.

- If the difference is 20,000, then:

- Let the number of males be 6y and females be y.

- Equation: 6y - y = 20,000, solving for y gives y = 4,000.

- Males = 6 * 4,000 = 24,000; Females = 4,000.

- Town C:

- Ratio: 11 males to 3 females.

- If the difference is 40,000, then:

- Let the number of males be 11z and females be 3z.

- Equation: 11z - 3z = 40,000, solving for z gives z = 5,000.

- Males = 11 * 5,000 = 55,000; Females = 3 * 5,000 = 15,000.

- Question: Difference between total males in Town A and C together and females in Town C:

- Total males in Town A and C: 17,500 + 55,000 = 72,500.

- Females in Town C: 15,000.

- Difference: 72,500 - 15,000 = 57,500.

- Among the provided options, Option 2: 57,500 is the correct answer.