Five-digit number

What is the five-digit number, no zeroes, in which the second digit is three times the first, the third is one more than the second, the fourth is four times the first, and the last is one-half more than the second? Click here for the solution The number is: 26789...

The peanuts and the monkey

Five men checked into a hotel with a bag of peanuts and a monkey. They planned on dividing the peanuts evenly the following morning. However, during the night, one of the men got up, divided the peanuts into five equal parts, took his fifth and had one leftover peanut...

Different arrangements

Four people can sit at a table in twenty-four different arrangements. How many arrangements are possible for seating eight people? Click here for the solution 40,320 ways. ShareTweet more riddles Five-digit number What is the five-digit number, no zeroes, in which the...

What is the engineer’s name?

Three business men Smith, Robinson, and Jones all live in the Leeds-Sheffield district Three railway men of similar names live in the same district. The business man Robinson and the guard live at Sheffield, the business man Jones and the stoker live at Leeds, while...

What’s the number?

It’s not easy having a mathematics professor as a new friend. When she invites you to her house she says, “All the houses on my side of the street are numbered consecutively in even numbers. There are six houses on my side of my block and the sum of their...

How long would it take him?

A cyclist rode a mile in three minutes with the wind, and returned in four minutes against the wind. Assuming that he always applies the same force to the pedals, how long would it take him to cycle a mile on a windless day? Click here for the solution If he can cycle...