A father is 7 years older than the mother and the mother’s age now is 3 times the age of the daughter. The daughter is 10 years old now. What was the father’s age when the daughter was born ?
Present age of daughter = 10 years
=> Present age of mother = 3 * 10 = 30 years
=> Present age of father = 30 + 7 = 37 years
$$\therefore$$ Father's age when the daughter was born = 37 - 10 = 27 years
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