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Basic Mathematics QUESTION #7991
Question 1
Five years ago, the average age of P and Q was 15 years. The average age of P, Q and R today is 20 years. How old will R be after 10 years?
  • 35 years
  • 40 years
  • 30 years✔️
  • 50 years
Correct Answer Explanation
Five years ago: P + Q = 30, so today P + Q = 40.
Today: P + Q + R = 60 (since average = 20).
Therefore R = 60 − 40 = 20 years today.
After 10 years: R = 20 + 10 = 30 years.