Saturday, May 27, 2017

Letter Groupings

The letters of the (English) alphabet can be grouped into four distinct categories.





Based on the categories established by the first 13 letters, can you place each of the remaining 13 letters in the correct group?

Saturday, May 20, 2017

Number Words

In the solution to A Unique Number, I asked a bonus question. "Can you think of a number whose letters when spelled out in English are all in alphabetical order?" Several people replied via Twitter with the correct answer of "forty." You may have found a shortcut to the solution if you noted that none of the single-digit numbers have their letters in alphabetical order, nor does the word "teen." This allows you to skip ahead to 20, 30, etc. Can you use a similar strategy to answer the following questions?
  • What is the lowest number that requires the five vowels A, E, I, O, and U only once each in its spelling?
  • What is the lowest number that requires the six letters A, E, I, O, U, and Y only once each in its spelling?
Click below to see the answers.

Saturday, May 13, 2017

The Nine Dot Puzzle

The following is a classic "thinking outside the box" puzzle. Can you connect all nine dots below by drawing exactly four straight lines, without lifting your pencil or tracing back over any line?

Give it a try before you click below for the answer.

Saturday, May 6, 2017

Apples and Oranges

You work in a factory boxing fruit. In front of you are three boxes labeled "apples," "oranges," and "apples & oranges." One box contains only apples, one contains only oranges, and one contains a mixture of both apples and oranges. Unfortunately, the label machine has gone haywire and has mislabeled all three boxes. Can you look at one piece of fruit from only one of the boxes and correctly label all three? Click below for the solution.

Saturday, April 29, 2017

Common Thread

What do the following words have in common?
  • dust
  • seed
  • left
  • resign
  • weather
  • sanction
Click below to see the answer.

Saturday, April 22, 2017

Marking a Ruler

A 13-inch ruler only needs four markings on it so that it can be used to measure any whole number of inches from 1 to 13. At what positions should the four markings be? (Do not include the two ends, which are understood to be markings 0 and 13.) Click below to see the answer.

Saturday, April 15, 2017

Move One Digit

The following equation is incorrect. Can you make the equation balanced by moving only a single digit?

101 - 102 = 1

Click below to see the answer.