skip to main content


Random Puzzles 


?

Puzzle 109 


How can you throw a ball such that it comes back?

No bounces are involved!

workings answer print

??

Puzzle 110 


A Proof That 2 = 1. Let A = B:

           A = B

multiply by A on both sides:

         A x A = A x B

subtract B x B from both sides:

   A x A – B x B = A x B – B x B

factorise:

  (A + B)(A – B) = B(A – B)

divide by (A – B) on both sides:

       (A + B) = B

replace A with B:

         B + B = B

factorise:

          2B = B

divide by B on both sides:

           2 = 1

Where lies the flaw in the logic?

workings answer print

?

Puzzle 111 


Starting with any number on the top row, make your way to the bottom, adding the numbers as you go.

Each time you must move to the next row, but you can move either straight down, or one place to the left or right.

What is the highest total you can make? What is the lowest?

Note: this puzzle is not interactive, and the numbers cannot be clicked.

Puzzle Copyright © Kevin Stone

workings hint answers print

??

Puzzle 112 


What are the next three characters in this sequence:

2  1  F  1  1  F  0  1  F  9  F  ?

Puzzle Copyright © Kevin Stone

workings hint answer print