Puzzle #132: Boys, Girls and Pennies

This is a very nice puzzle borrowed from Alok Mittal’s Mathematical Circles class.

Five boys and five girls found five pennies. It was decided to arrange the group in circle, and count out individuals at fixed intervals, giving them a penny as they leave. A clever boy came up with a scheme to arrange the kids in the circle so that all the boys would count out first. The girl standing at the first place, though, insisted that she be allowed to determine the interval, and arranged it so that all girls got counted out first. The arrangement in the circle was as under (Start at 1, and go clockwise). What were the intervals the boy and the girl thought of?

Puzzle #132 Graphic

Puzzle #132 Graphic

As always, please send your answers as comments within the blog (preferred), or send an e-mail to alokgoyal_2001@yahoo.com. Please do share the puzzle with others if you like, and please also send puzzles that you have come across that you think I can share in this blog.

Happy penny pinching!

This entry was posted in Puzzles and tagged , . Bookmark the permalink.

2 Responses to Puzzle #132: Boys, Girls and Pennies

  1. Suman says:

    boy’s counted every 14th and girls counted every 13th

  2. Manjiri says:

    Boys’ interval 14 and Girls’ interval = 13

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s