## Task 6 - 080736

The great German mathematician Carl Friedrich Gauss was born on April 30, 1777, in Braunschweig.

On which day of the week did his birthday fall?

(April 30, 1967, was a Sunday; the years 1800 and 1900 were not leap years).
From one day of the year 1777 to the same day of the year 1967, it is 190 years, and specifically 45 years with 366 days and 145 years with 365 days.

In the 45 years, the weekday moved forward by 90 weekdays, and in the 145 years by 145 weekdays. Together, this is 235 weekdays, i.e., 33 times a week and 4 weekdays. Therefore, April 30, 1777, was a Wednesday.

Solutions of the III. Round 1968 adopted from [5]

### 4.11 IX. Olympiad 1969

### 4.11.1 I. Round 1969, Class 7