techdirections February 2010 : Page 44

digital fun  Use 10 pennies to form a pyramid like the one below. Now, moving one penny at a time, reverse the pyramid in three moves.  If eight men can mow eight lawns in 80 min- utes, how long would it take seven men to mow seven lawns?  The shape on the left was cut to form the component parts on the right. Can you sketch two lines on the whole that would produce the pieces shown?  How many Y's do you need to balance the X on the last seesaw?  Using the numbers 1 through 10, place one number in each box so that no consecutive numbers touch in any direction.—I. J. Sonsky, Brooklyn, NY. See answers on page 42. We will pay $25 for brainteasers, one-period challenges, and puzzles; $20 for cartoons; and $5 for jokes and humorous anecdotes used on this page. Preferable theme for all submissions is applied science, technology, and technical edu- cation. Send contributions to susanne@tech directions.com or mail to “More Than Fun,” PO Box 8623, Ann Arbor, MI 48107-8623. 44 techdirections  FEBRUARY 2010 

Digital Fun

Switcheroo
Use 10 pennies to form a pyramid like the one below. Now, moving one penny at a time, reverse the pyramid in three moves.

Balancing Act
How many Y's do you need to balance the X on the last seesaw?

Power Mower
If eight men can mow eight lawns in 80 minutes, how long would it take seven men to mow seven lawns?

Divide and Conquer
The shape on the left was cut to form the component parts on the right. Can you sketch two lines on the whole that would produce the pieces shown?

Number Challenge
Using the numbers 1 through 10, place one number in each box so that no consecutive numbers touch in any direction.—I. J. Sonsky, Brooklyn, NY.

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