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Puzzle
Math Group
Saturday, October 9, 2004
Which One?
Topic: Puzzle
The deadline for this puzzle is November 9.

Would you rather get

a penny on November 1, two pennies on November 2, four pennies on November 3, and so on, each day receiving twice as much as the day before until the end of the month,

or

10 cents on the first day, 20 on the second, 30 on November 3, and so on, each day receiving 10 cents more than the day before until the end of the month?

Which one is bigger? Explain your answer.

Posted by Rosalind Diaz at 11:40 AM MDT
Updated: Sunday, October 17, 2004 8:16 AM MDT
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Tuesday, October 5, 2004
Stairsteps
Topic: Puzzle


The deadline for this puzzle is October 31.




Look at the picture above. (If it doesn't show up on your screen, you can still do the puzzle. Draw yourself a picture if you like.) Here we have a square. Each side measures 20 feet. Running from corner to corner of the square is a red "stairstep" pattern. Each stair has the same height and the same width; each one is perfectly parallel to the top and bottom of the square.

If there are 15 stairs, how long would the red line be if we pulled it out flat? In other words, what number would we get if we added up the height and width of all the steps?

What about if there are 50 stairs?

Please click on "post comment" to send me your answers. Solutions will not be posted until after October 31, to give everyone a chance to try the puzzle.

If the "post comment" link doesn't work, email me at:
rosalind_diaz@yahoo.com

Posted by Rosalind Diaz at 4:20 PM MDT
Updated: Friday, October 8, 2004 12:36 PM MDT
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Saturday, October 2, 2004

Hello, math group. I have created a "blog" (short for weblog) for you to visit. Come here to see links to websites and other interesting things.

Posted by Rosalind Diaz at 12:57 PM MDT
Updated: Saturday, October 9, 2004 11:36 AM MDT
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