For those born in the \(20\)th century.

Think of a number from \(1\) to \(7\).

With the help of this secret number, you will do five operations. You will get something very revealing about yourself.

- Multiply this number by \(2\).
- Add \(2\).
- Multiply the result by \(50\).
- If your birthday has already passed this year, add \(18\), otherwise add \(17\).
- Subtract the last two digits of the year of your birth.

The result is a three digit number. The first one is the number that you thought and the last two are ... your age!

Note: This astuteness is valid for the year \(2018\). For \(2019\), you must add one unit to the numbers referred in point 4. For \(2020\), two units and so on.

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