A father's age is 7 years more than the mother's age, and at present, the mother's age is 3 times the daughter's age. What is the father's age at the birth of the daughter?

At daughter's birth, daughter's age = 0. Mother's age then = present age - daughter's present age. If daughter's present age = d, mother's present age = 3d, father's present age = 3d + 7. At daughter's birth (d years ago), father's age = (3d + 7) - d = 2d + 7. But mother's age then = 3d - d = 2d, so father was 7 years older than mother, which matches given. However, we need to find actual values. At daughter's birth, father's age = (mother's age at daughter's birth) + 7. But mother's age at daughter's birth = daughter's present age = d. So father's age at daughter's birth = d + 7. But this is not matching any option directly. Actually, if father is always 7 years older than mother, and at daughter's birth mother's age was d (daughter's current age), then father's age at daughter's birth = d + 7. This only works if d = 20, giving father's age = 27 at daughter's birth. Option A (27 years) is the only one where father is 7 years older than mother (mother would be 20).