LOGICAL PROBLEMS

001 (HARD)

TWENTY FIVE HORSES

There are 25 horses. You can race up to 5 horses at a time. How many races are required for you to determine the top three fastest horses (in order).

You cannot time the races. The horses always run at the same speed.

002 (VERY HARD)

TEETER TOTTER

Twelve individuals are at the park. Eleven of the individuals weigh exactly the same. There is a teeter totter. Using the teeter totter just three times, how can you determine which individual has a different weight.

Interesting note: This problem was talked about on the famous TV program Brooklyn Nine Nine when the character name Holt brings it up. Therefore, some refer to it as the Holt problem.

003 (EASY)

HOW MANY COINS?

How many coins do I have if only one statement is true?

Statement 1 - I have at least one coin.

Statement 2 - I have fewer than five coins.

Statement 3 - I have at least five coins.

004 (EASY)

A FAIR RACE?

Betty and Bob have a 100m race. When Betty reaches the end of the race, Bob is at the 90m mark. They decide to do a second race but Betty backs up another 10m.

Who will win this second race?

Possible next one:

https://www.youtube.com/watch?v=r5a5n0SHkw0 riddle #7 (barrels)