Understanding The Math: 79 Beers Minus 40

At the end of each year, a viral social media post does the rounds that correctly identifies the year of people's birth. The post, which has been seen in various forms, works as follows: 79 beers minus your age, plus 40 dollars, equals the year you were born. This works for anyone born before 2000 as 79+40=119, the number of years from 1900 to 2019. Subtracting your age from 119 will give you the year you were born.

The equation only works for people born before 2000

The viral equation, 79 beers - your age + 40 dollars = the year you were born, is a fun trick that has been making the rounds on social media. It is based on simple math and works for most people born before 2000.

The equation works because of the variable of age. No matter what number you put in for age, as long as you weren't born in the 1900s, the math will always give you the last two digits of the year you were born. This is because 79+40=119, which is the number of years from 1900 to 2019. Subtracting your age from 119 will give you the year you were born, with the same first two digits (19 or 20).

For example, if you were born in 1971, in 2019 you would have been 48 years old. Using the equation, 79-48=31, and 31+40=71.

However, this trick only works well at the end of the year, as by then, most people will have had a birthday in the current year. The only time it will work for everyone born in the 1900s is on December 31, 2019.

As the years go by, the equation will work for fewer and fewer people, as it won't work for those born in the 2000s. For now, it's a fun trick to impress your friends with!

It doesn't work for people with birthdays after January 9th

The 79 beers minus 40 trick is a simple mathematical formula that calculates the last two digits of the year a person was born. The formula is as follows: 79 (beers) minus [your age] plus 40 ($) equals the last two digits of the year of your birth.

However, this formula only works for people born before the year 2000. For those born after 1999, the formula will not yield the correct result, and you will get a big negative number instead. This is because the formula essentially calculates the number of years between your birth and 1900.

Additionally, the formula only works well towards the end of the year, as most people would have had their birthday in the current year by then. For example, if your birthday is on January 9, 2024, and you calculate it using the formula, it will not work. As of January 2024, you would be considered 21 years old (2024 - 2003). Plugging this into the formula, we get: 79 - 21 + 40. This equals 98, which is not the last two digits of your birth year.

The formula is a fun trick that can be used to impress friends, but it is important to recognize that it is not miraculous and has limitations.

The formula can be adjusted to work for people born after 1999

The viral trend "79 beers minus 40" is a simple mathematical trick that reveals the last two digits of the year you were born. The formula is: 79 (beers) - your age + 40 = the year of birth. For example, if you were 48 years old at the end of 2019: 79-48=31. Adding 40 gives you 71, so 1971.

However, the trick does not work for people born after 1999. This is because the formula calculates the number of years between your birth and 1900, which only works for those born before 2000. For instance, if you were born in 2001, the formula would give you 101, not 01.

To adjust the formula for people born after 1999, you can add 1,900 to the final result. Using the previous example of someone born in 2001, the calculation would be: 79-18+40=101. Adding 1,900 gives you 2001, the correct year of birth.

Alternatively, you can simply change the numbers used in the formula. At the end of 2020, the formula changed to 80 beers instead of 79, to account for another year having passed. This formula will only work for those born before 2001. So, for the formula to work for people born after 1999 in the future, you would need to keep adding 1 to the number of beers each year.

It only works well at the end of the year

The viral social media post that works out the year of your birth is based on a simple mathematical formula. The formula only works well at the end of the year, as this is when most people will have had a birthday in the current year.

The formula is: 79 beers (or 78/80 beers depending on the year) minus your age, plus 40 dollars/cigarettes, equals the year you were born. The math works out because of the variable of age. No matter what number you put in there, as long as you weren't born in the 1900s, the math will always work out to be the last two digits of the year you were born. For example, 79+40=119. That's the number of years from 1900 to 2019. Subtract your age from 119 and you'll get the year you were born.

So, at the end of 2019, if you were 48 years old, you would calculate it as follows: 79-48=31. Add 40 and you get 71. If you were born after 1900, this will give you the last two digits of the year you were born, in this case, 1971.

The formula only works for people born before 2000, and it only works well at the end of the year. This is because, by this time, most people will have had a birthday in the current year. For example, if you were 48 years old at the end of 2019, you would have been 49 at the end of 2020, so you would use 80 beers instead of 79, and the formula would be 80-49=31. Add 40 and you still get 71.

As the years go by, the formula will work for fewer and fewer people, as those born in the 2000s will not get the right answer.

The formula can be rewritten as B - 1900

The formula 79 beers minus your age plus 40 dollars is a fun trick to calculate the year of your birth. However, the formula only works for those born before 1999, as it is based on the difference between the current year and 1900.

For example, let's say you were born in 1971. In December 2019, you would have been 48 years old. Using the formula, 79 beers minus 48 years plus 40 dollars equals 71. This is because 79-48=31, and 31 plus 40 equals 71, which are the last two digits of 1971.

The trick relies on the variable of age. As long as you were born before the current year, the math will work out to be the last two digits of your birth year. However, it only works well at the end of the year, after most people have had their birthday. For those born in 2000 or later, the formula would need to be adjusted by adding 2000 to the final result.

Additionally, the trick assumes that one's birthday has already passed in the current year. If your birthday is in January, for example, the formula would need to be adjusted by subtracting one from the number of beers to account for the change in age.

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