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Q: The average age of mother and father is 28 years.The average age of mother, father and their son is 20 years. What is the age of the son?
  • A. 4 years
  • B. 3 years
  • C. 6 years
  • D. 5 years
Correct Answer: Option A - According to the question, Sum of ages of mother and father = 28 × 2 = 56 years Sum of age of mother, father and son = 20 × 3 = 60 year Hence, Age of son = (60 – 56) = 4 years
A. According to the question, Sum of ages of mother and father = 28 × 2 = 56 years Sum of age of mother, father and son = 20 × 3 = 60 year Hence, Age of son = (60 – 56) = 4 years

Explanations:

According to the question, Sum of ages of mother and father = 28 × 2 = 56 years Sum of age of mother, father and son = 20 × 3 = 60 year Hence, Age of son = (60 – 56) = 4 years