## Task 11/62

Calculation of the year 1962 from the birthday

Write down your birthday. Double the number of the day and add the number of the month to the result.

(Example: Birthday 27.8., number of the day 27, number of the month 8, calculation: 2 * 27 + 8 = 62.) Multiply this new result by 5 and add 400. Subtract the tenfold of the day number from this. From the double of this result, subtract the tenfold of the month number.

If you multiply the number thus obtained by 2.5 and finally subtract 38, you get the number 1962. How is this possible with such different initial values?