Arun's age is half as his father. Twelve years ago, his father's age was three times that of Arun's, what is the present age of Arun?

 a) 24
 b) 36
 c) 48
 d) 12
TNPSC Jailor-2016

24.
Solution
Let father's age be x
12 years before,
x-12 = 3(x/2 - 12)
x = 48.
Age of Arun = 24
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