10ticks Friday Puzzle

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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

Let N be the product of the first eleven positive integers.

If  N10x   is an integer, what is the maximum possible value of x?


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Friday Puzzle (19/05/2017)

In the diagram, how many degrees in total are the four marked angles, in terms of a and b?


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Friday Puzzle (12/05/2017)

It takes 3 seconds to blow up a perfectly spherical balloon so it has a diameter of 6 inches.

Betty wants it bigger, so keep blowing.

How much longer will it take to blow up the balloon from a diameter of 6 inches to a diameter of 12 inches?

Note: the rate of air input is constant and no other external factors affect the balloon.

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Friday Puzzle (05/05/2017)

The length of a rectangle is 2/5 the perimeter of the rectangle.

What fraction of the rectangle’s length is the width?

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Friday Puzzle (28/04/2017)

A man’s age, when the digits are reversed, is the same as his daughter’s age.

The sum of their ages is 99 and the difference between their ages is a cubic number.

Find the ages of the man and his daughter.

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Friday Puzzle (21/04/2017)

An uncancelled fraction is equal to 1/2. Its numerator is reduced by 2 and its denominator increased by 2 so the fraction is now worth 1/3. What was the original fraction?

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Friday Puzzle (07/04/2017)

153 is a 3-digit number where the sum of the cubes of the digits is equal to the number.
13 + 53 + 33 = 153

Find another 3-digit number that has this property.
(There are 3 more!)

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Friday Puzzle (31/03/2017)

The sum of the consecutive integers from -72 to x, inclusive is 298.

What is x?

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Friday Puzzle (24/03/2017)

A rectangle is inscribed into the quadrant of a circle as shown.

Given the unit distances shown, find the length of AC.


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Friday Puzzle (17/03/2017)

The lowest common factor of 1147 and 1517 is 1.
What is the next lowest common factor?

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