Question

One day Krishnayya and his $10year$ old granddaughter Subbu are having the following conversation:

Subbu : Grandpa, When were you born?
Krishnayya then gave a Mathematical puzzle to his granddaughter to solve.

Grandfather: Kid, I am $8$ more than $6times$ your age by now($2015$).
Subbu started thinking. Being good at Mathematics, Subbu screamed her grandpa's year of birth in less than a minute.
Which year do you think he was born?

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Answer 1

Subbu's age is $10$ years now. So her grandpa's age is
$8+6\times 10=8+60=68$
Grandpa is $68years$ old by $2015$. So he was born in $1947$.