A father tells his son, "I was of your present age when you were born." If the father is 36 years of age now, how old was the boy 5 years back?
A
13
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B
15
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C
17
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D
20
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Solution
The correct option is C13 Let father's age be F and son's age be S. then, F=2S and, F=36 hence, S=362=18 years Now, son's age 5 years back =18−5=13 years