Math Jokes for National Doughnut Day

June 7, 2013 at 12:46 pm 3 comments

Today is National Doughnut Day, and if you need your fix, Time reports that free doughnuts are available from Dunkin’ Donuts, Krispy Kreme, Tastykake or Winn Dixie.

TorusAt MJ4MF, we can’t let this day pass without telling the obvious joke…

A topologist is a mathematician who can’t tell a coffee cup from a doughnut.

And the modification…

How many topologists does it take to change a light bulb?
Just one. But what’ll you do with the doughnut?

To help you celebrate, here’s a doughnut-related math problem.

Several years ago, Dunkin’ Donuts ran a commercial bragging about how picky they were. The commercial stated:

We reject more than one million pounds of coffee beans a year.

Sure sounds impressive, doesn’t it? But how picky are they, really? Do a back-of-the-envelope estimate, and I think you’ll realize that they’re not all that picky after all.

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3 Comments Add your own

  • 1. Emerson´s Cafe  |  July 21, 2015 at 10:24 pm

    Dear Mr. MJ4MF,

    If these data are correct, I got these estimatives:

    One cup of coffee needs 70 beans – 40 grams
    One million pounds (453.000 kilograms) of coffee could produce 11,325,000 cups.
    Someone wrote that Dunkin Donuts sells 10.465.000 cups of coffee each day (in the world ?)
    That means – 1 million pounds of coffee beans is the amount required for one day and some hours. Let´s say: 1,5 day / 365 days = rejection of 0,4% !!!???!!?? Only that ?? Incredible !!
    – 99,6% of acceptance –

    So – they ARE really picky !! 😮
    Yes. In fact this amount of coffee could feed all living creatures in Pluto for many centuries. If every year one million pounds of coffee were sent to Pluto, in some years we would see the impact on its weight and its orbital period.

    We could send coffee and bring stones from Pluto … some milligrams of these stones would be the special ingredient served in my world famous Space Cafe. And Pluto would become the only planet composed of pure (though rejected) coffee.

    • 2. venneblock  |  July 27, 2015 at 12:52 pm

      Awesome! I hadn’t seen the statistic about Dunkin Donuts selling 10.5 million cups of coffee a day, but I did find that there are nearly 11,000 Dunkin Donuts shops worldwide. That means that, on average, they’d each need to serve about 1,000 cups of coffee a day, which seems reasonable.

      Yep, not very picky at all… whether on Earth or on Pluto!

  • 3. Happy Deep Fried Torus Day – Study Score Calc  |  January 21, 2017 at 4:20 am

    […] of the blog MathJokes4MathyFolks. Even Stephen Colbert got in on the action, smooshing a doughnut on the Colbert […]


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About MJ4MF

The Math Jokes 4 Mathy Folks blog is an online extension to the book Math Jokes 4 Mathy Folks. The blog contains jokes submitted by readers, new jokes discovered by the author, details about speaking appearances and workshops, and other random bits of information that might be interesting to the strange folks who like math jokes.

MJ4MF (offline version)

Math Jokes 4 Mathy Folks is available from Amazon, Borders, Barnes & Noble, NCTM, Robert D. Reed Publishers, and other purveyors of exceptional literature.

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June 2013

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