November 2019 November 2019 - Page 5

"How did he do that?

You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can’t feel, see or in any other way find out which 10 are heads up. How do you split the coins into two piles so there are the same number of heads-up coins in each pile?

The first sentence told us who and who went to the movies and also gave us a description of them. The second and third gave what a gave a ' family tree description' (or were distractions). The couple were the only one mentioned that went to the movies. ‘Who has 15 daughters' was used to describe the 'couple' probably to distinguish them from others. Though they had 15 daughters but it wasn't mentioned that they went with the COUPLE. The 15 daughters had 12 brothers but it wasn't mentioned also that they went with the COUPLE. The brothers had 10 kids each and these likewise didn't go with the COUPLE neither. So only the COUPLE went to the movies.

Correct Answer Submitted By:

William Lambert, PE, NHDOT

Jim Wheeler, PE, City Manager, Berlin NH

Michael Roether, PE, Weston Sampson

William Cunningham, PE, Mohawk Northeast, Inc.

Michael Summerlin, JR., PE, NHDES

Cranium Challenge

October Solution

Please send you answers to

Thomas Selling via e-mail:

Correct responses will be recognized in the future issues of the New Hampshire Civil Engineer.

November Challenge