Explanation:

- Let's assume the present age of the mother is 7x and the daughter is x.

- According to the future ratio condition:

- (7x + 5) : (x + 5) = 4 : 1.

- Solving this equation:

- 7x + 5 = 4(x + 5)

- 7x + 5 = 4x + 20

- 7x - 4x = 20 - 5

- 3x = 15

- x = 5

- The present age of the mother = 7 * 5 = 35 years.

- The present age of the daughter = 5 years.

- The difference in their ages = 35 - 5 = 30 years.

- The correct option is Option:2, 30.

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