![]() But just after the opening ceremony, your assistant reminds you that the metal you used for the handrail expands slightly in summer, so that its length will increase by one inch in total. Jeffrey Ungar.įinally, the Great American Rail-Trail across the whole country is complete! Go ahead, pat yourself on the back-you’ve just installed the longest handrail in the history of the world, with 4,000 miles from beginning to end. This problem was suggested by the physicist P. Riddle #9: Can You Solve the Great American Rail-Trail Riddle? Who should you choose in order to make sure you win the peppermint patty? Hintįirst, solve for a pile of 10 caramels. Suppose Caryn lets you decide who goes first. The person who removes the last caramel will also get the peppermint patty. You and Caryn will go back and forth taking at least one and no more than five caramels from the candy pile in each turn. You’re facing your friend, Caryn, in a “candy-off,” which works as follows: There’s a pile of 100 caramels and one peppermint patty. Riddle #8: This Peppermint Patty Riddle Is Practically Impossible If they both take the shortest possible route to reach their crumb, who will reach their crumb first? (Don’t forget they’re ants, so of course they can climb anywhere on the edges or surface of the cuboid.) Hint The measurements of their cuboids are as pictured: So they decide to create a race where one of them (hopefully) will win.įor this race, each of them will start at the bottom corner of a cuboid, and then crawl as fast as they can to reach a crumb at the opposite corner. ![]() They love to race each other, but always tie, since they actually crawl at the exact same speed. Riddle #7: Here's a Really Hard Math Problem About Ants The trains always arrive at their scheduled times. ![]() Jesse promises he’s indeed heading to the station at a random time each day. Both of his grandmothers are okay with this plan, since they know both the northbound and southbound trains run every 20 minutes.īut after a few months of doing this, Grandma Cara complains that she sees him only one out of five Sundays. If it happens to be the train traveling north, he’ll visit his Grandma Erica uptown, and if it happens to be the train traveling south, he’ll visit his Grandma Cara downtown. As a compromise, he tells them that every Sunday, he’ll head to the subway station nearest to his apartment at a random time of the day and will hop on the next train that arrives. Jesse’s two grandmothers want to see him every weekend, but they live on opposite sides of town. Ready for the solution? Click here to see if you're right. You might want to try solving for the case of 10 unlabeled circuit breakers first. The solution does not involve either switching on or off the light switches in your house or feeling how hot the lightbulbs are. What is the minimum number of trips you need to make to the basement to map every circuit breaker to every light? Hint You can then roam the hallways of your house to discover which lights are on and which are off. On every trip to your basement, you can switch any number of circuit breakers on or off. To start with, you switch all 100 lights in the house to “on,” and then you head down to your basement to begin the onerous mapping process. (Suppose each circuit breaker maps to only one light.) To your chagrin, you discover none of the 100 circuit breakers is labeled, and you face the daunting prospect of matching each circuit breaker to its respective light. The circuit breaker box in your new house is in an inconvenient corner of your basement. Riddle #5: Our Circuit Breaker Riddle Is Pure Evil. How many total games were played? Solution Who won the fourth game against whom? Hint Kenny, who is less winded, tallies up the games played: At the end of their pickleball afternoon, Abby is exhausted, having played the last seven straight games. Kenny, Abby, and Ned got together for a round-robin pickleball tournament, where, as usual, the winner stays on after each game to play the person who sat out that game. Riddle #4: Try to Solve This Pickleball Puzzle So you bring it into a jeweler, who tells you the cost of making the necklace will be $10 for each gold link that she has to break and then reseal. It occurs to you that if you combined them all into one big loop of 20 links, you’d have an incredible necklace. You’re rummaging around your great grandmother’s attic when you find five short chains each made of four gold links. Riddle #3: The Gold Chain Math Problem Is Deceptively Simple Ready for the solution? Click here to see if you’re right. How many eggs does one hen lay in one day? Solution It’s due to him that I love math puzzles, and this is one of the first problems (of many) that he gave me when I was growing up.Ī hen and a half lays an egg and a half in a day and a half. This problem is in honor of my dad, Harold Feiveson. Riddle #2: How Many Eggs Does This Hen Lay?
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