The alternative uses of Colospa Tablet (15) have also been explained below. 1976, however, does have a key number of 4, which would make this person 28 - right about where you estimated his age! We know the person is probably either 33 or 28, so how does the person carry themselves? For an example, let's say the person says "June 15th, Tuesday", and you estimate that the person looks to be around 30, and you're performing this in 2004 (yes, the current year is important).

Since the person in our example looks to be 30, and this is being performed in 2004, we're looking for a year around 1974 with a key number of 4. A quick mental run from 4 years before to 4 years after 1974 show that both 1971 and 1976 will fit the bill. While they're looking up the day of the week for their birthday, estimate how old they are.

Hand a willing participant a perpetual calendar, and ask them to give their birthday, without the year, and the day of the week on which it fell.

Earlier, Avertissement you learned that the date plus the month key number plus the year key number equals the day of week key number (casting out 7s as you go). After casting out 7s, this will give you the year key number for which you will be searching. From this, subtract the date and the key number for the month. In this case, the only 4 month is June (remember "JUNioR?, alone in a big empty room"?), so we can reply that the only Friday the 13th in 1997 happens in June.

This would be very easy to work with, as not only would January 1st always fall on, Avertissement say, a Sunday, but so would the first of every month! January 1st would always fall on the same day each year, but we'd need to remember key numbers for each month, in order to adjust for the fact that not all months begin on that same day. Fortunately, you only need to worry about the possibility of leap years if you're given a January or February.

All the months with this key (except February) will also have 5 of the given day.

When you're given a January or February date that results in two answers that are way off (assuming your age-estimation skills are good), then you may be dealing with a leap year. So, the answers to which months in 1963 had 5 Tuesdays are January, October, April, July and December. In our example, we came up with a total of 0, which tells us that, in 1963, the months with a key of 0 and at least 29 days will have 5 Tuesdays in them.

In our example, 6 minus 1 is 5, so the "5" months with 31 days will also have 5 Tuesdays in 1963.