Q:
Karthik is now 32 years old and his son is 7 years old. In how many years will Karthik be twice as old as the son?
Answer & Explanation
Answer: A) 18
Explanation: Given Karthik’s age = 32 years
Karthik’s son age = 7 years
Difference between their ages = K - S = 32 - 7 = 25 years ….(1)
Now, required K = 2S ……(2)
Put (2) in (1)
2S - S = 25
=> S = 25 years
Hence, at the age of 25 years of Karthik’s son, Karthik will be twice as his son’s age.
25 - 7 = 18 years
Therefore, after 18 years the father be twice as old as the son.
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