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# Mathematics through the years

Teaching Math in 1950:

A logger sells a truckload of lumber for \$100. His cost of production is 4/5 of the price. What is his profit?

Teaching Math in 1960:

A logger sells a truckload of lumber for \$100. His cost of production is 4/5 of the price, or \$80. What is his profit?

Teaching Math in 1970:

A logger exchanges a set "L" of lumber for a set "M" of money. The carnality of set "M" is 100. Each element is worth one dollar. Make 100 dots representing the elements of the set "M." The set "C," the cost of production contains 20 fewer points than set "M." Represent the set "C" as a subset of set "M" and answer the following question: What is the carnality of the set "P" of profits?

Teaching Math in 1980:

A logger sells a truckload of lumber for \$100. His cost of production is \$80 and his profit is \$20. Your assignment: Underline the number 20.

Teaching Math in 1990:

By cutting down beautiful forest trees, the logger makes \$20. What do you think of this way of making a living? Topic for class participation after answering the question: How did the forest birds and squirrels "feel" as the logger cut down the trees? There are no wrong answers.

Teaching Math in 2002:

A logger sells a truckload of lumber for \$100. His cost of production is \$120. How does Arthur Andersen determine that his profit margin is \$60?

Teaching Math in 2010:

El hachero vende un camion carga por \$100. La cuesta de production es .
The city kid was working out in the country with one of the local farmers.

One day the farmer's donkey packed it in and died.
To the amazement of the farmer, the kid offered to take the dead donkey.
When the farmer asked what were the kids plans with the dead donkey, the kid responded that he was going to raffle it off.

The farmer said "you can't raffle off a dead donkey, no one will buy a ticket". The kid responded "watch me, I'm not going to tell anyone it is dead."

After a week had past, the farmer asked how things were going with the dead donkey raffle.
The kid said he sold 500 tickets at two dollars each and cleared \$998.

The farmer inquired if anyone had complained.

The kid responded "Yes, the guy who won", but that he had given that one person his \$2 back.

Sonnds like modern math to me!

CalG
LOL - good one! I especially liked:

>... The carnality of set "M" is 100 ...

So does knowing about sets give you carnal knowledge of them?

From dictionary.com:

carnality
\Car*nal"i*ty\, n. [L. carnalitas.] The state of being carnal; fleshly lust, or the indulgence of lust; grossness of mind.

cardinality
<mathematics> The number of elements in a set. If two sets have the same number of elements (i.e. there is a bijection between them) then they have the same cardinality. A cardinality is thus an isomorphism class in the category of sets. aleph 0 is defined as the cardinality of the first infinite ordinal, omega (the number of natural numbers).

Tom / PM

[ October 23, 2002, 11:17 AM: Message edited by: PhysicsMan ]
More modern math to laugh about.

Our company just distributed the personal statements for the performance of our 401K

Question:
If an employee participates in a 401 K plan for one year at a tax deferred \$100 bucks a week, with an employer match of 30%
What is the increased value of this plan in real dollars to the emplyee at the end of this time?

Answer:

about -\$1000

It is a sick system that encourages "the little guy" to risk and loose what small assests he may scratch to put away, while those on the "inside" walk away with huge "profits" (stolen goods?)

Regards

CalG
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