Filed Under:

A Four-Letter Word For Capital City

Play associated audio

On-Air Challenge: Every answer is the name of a world capital. You'll be given a four-letter word. The first two letters are the first two letters of the city's name, and the last two are the last two letters of the country's name. For example, if you were given "loin," the answer would be London, Great Britain.

Last Week's Challenge from the Grabarchuk family: Take 15 coins. Arrange them in an equilateral triangle with one coin at the top, two coins touching below, three coins below that, then four, then five. Remove the three coins at the corners so you're left with 12 coins. Using the centers of the 12 coins as points, how many equilateral triangles can you find by joining points with lines?

Answer: 25 equilateral triangles

Winner: Chris Anderson from Portland, Ore.

Next Week's Challenge from listener Henry Hook of Brooklyn, N.Y.: What number comes next in the following series: 2, 4, 6, 9, 11, 15, 20, 40, 60 and 90?

Submit Your Answer

If you know the answer to next week's challenge, submit it here. Listeners who submit correct answers win a chance to play the on-air puzzle. Important: Include a phone number where we can reach you Thursday at 3 p.m. Eastern.

Copyright 2011 National Public Radio. To see more, visit


Not My Job: Comedian Carol Burnett Gets Quizzed On Cougars (The Cats, Of Course)

In the 1970s, families would sit down together every Saturday to watch The Carol Burnett Show. The first five seasons of the legendary variety show are now out on DVD.

Time To Pursue The Pawpaw, America's Fleeting Fall Fruit

Ever seen a pawpaw in the supermarket? Didn't think so. Ohioan Chris Chmiel wants to change that by growing and promoting this seasonal, mango-like fruit that's native to the U.S.

An Evangelical Leader's Changing Views On Gun Ownership

As legislators fail to find solutions to mass shootings, Evangelical Minister Rob Schenck thinks religious groups have a part to play in educating people about guns and their relationships with them.

This Week In Data Collection News, And The Privacy Paradox

As California tightened its digital privacy protections, news involving Google, Pandora and other firms highlighted the way companies increasingly rely on data about their users. How much do we care?

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.