Answers 409- A SQUARE WITH FOUR PENNIES
The illustration indicates how we may show a square with four pennies. The
sides of the square are the lines beneath Britannia.
- SIMPLE ADDITION
Add IV turned upside down below VI and you get XI.- A CALENDAR PUZZLE
Every year divisible by 4 without remainder is bissextile (leap year), except
that every year divisible by 100 without remainder is not leap year, unless it
be also divisible by 400 without remainder, when it is leap year. This is not
generally understood. Thus 1800 was not leap year, nor was 1900; but 2000,
2400, 2800, etc., will all be leap years. The first day of the present century,
January I, 1901, was Tuesday.
The present century will contain 25 leap years, because 2000 is leap year,
and therefore 36,525 (365 X 100 + 25) days, or 5217 weeks and 6 days; so
that January 1,2001, will be 6 days later than Tuesday-that is Monday. The
century beginning January I, 2001, will contain only 24 leap years, because
2100 is not leap year, and January 1,2101, will be 5 days later than Monday,