10ticks Friday Puzzle

About us

Welcome to Ian’s Friday Puzzle! Dust off those Friday cobwebs with a little manipulation of the old grey matter. Perplexing puzzles, logical, illogical, and sometimes just plain stupid. Be prepared to be bewildered, befuddled and bedazzled!

See the latest Friday Puzzle below and look at all the past puzzles. Get the Friday Puzzle straight to your phone, follow us on Twitter. The first 5 correct answers join our Hall of Fame!

This week's Friday Puzzle

Five squares are drawn on the sides of a pentagon as shown.

pentagon and square

What is the sum of the five angles marked in red?

Show answer

Friday Puzzle (16/03/2018)

Lynne: “Jane is innocent” 
George: “Tim is guilty” 
Jane: “George is guilty” 
Tim: “Lynne is innocent” 
Only the guilty person is lying; all the others are telling the truth.

Who is guilty?

Show answer

Friday Puzzle (09/03/2018)

The difference between 1/4 of a certain number and 1/5 of the same number is 3.

What is that number?

Show answer

Friday Puzzle (02/03/2018)

Find the positive integer, x, that satisfies the equation

√3  +  √12  +  √27  =  √x

Show answer

Friday Puzzle (23/02/2018)

The five equally sized rectangles are placed inside a square as shown.

Rectangles in Square

The square has a side length of 24 cm.

What is the area of one rectangle?

Show answer

Friday Puzzle (16/02/2018)

The three rectangles below all have the same area.


What is the value of x + y?

Show answer

Friday Puzzle (09/02/2018)

The largest of four different real numbers is x.

When the numbers are summed in pairs, the four largest sums are 13, 12, 10 and 9.

What are the possible values of x?

Show answer

Friday Puzzle (02/02/2018)

The areas of three of the faces of a cuboid are 24 cm2, 18 cm2 and 12 cm2.

What is the volume of the cuboid?

Show answer

Friday Puzzle (26/01/2018)

A square lies on a circle such that one edge passes through its centre, and two vertices lie on the circumference, as shown.

circle and square

The circle has a radius of 1 cm.

What is the area of the square?

Show answer

Friday Puzzle (19/01/2018)

A record is shaded as shown. It has no hole!

The radius of the label (white) is a third the radius of the record.

What is the ratio of the black shaded area to the area of the label (white area)?

Show answer

Follow @10ticks

About Us  Blog  Friday Puzzle  FAQ  CSR  Link to Us  Terms & Conditions 

All contents ©Fisher Educational Ltd 2002. All rights reserved. 10ticks.co.uk is the trading name and Registered trade mark of Fisher Educational Ltd. Registered in England No. 3668099