The average age of a father and a mother is 35 years. The average age of the father, the mother and their daughter is 25 years. What is the age of their daughter?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 5 years
An average multiplied by the number of people gives the total of their ages; the daughter’s age is the difference between the two totals.
Total age of the father and the mother \(=35\times2=70\) years
Total age of all three \(=25\times3=75\) years
Adding the daughter raises the total from 70 to 75 years, so her age \(=75-70=5\) years