10ticks Friday Puzzle
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!
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This week's Friday Puzzle
A triangle sits perfectly on top of a square.
The triangle and square have the same perimeter.
What is the ratio of the perimeter of the irregular pentagon
(formed by the square and triangle) to the perimeter of the square?
Friday Puzzle (02/11/2018)
My new TV screen has sides in the ratio of 16:9.
My old TV screen had sides in the ratio of 4:3.
A picture that fills my new TV fills the width of my old TV, but not the height.
What fraction of my old TV’s screen is not covered?
Friday Puzzle (26/10/2018)
I invent the new dartboard shown.
I throw two darts at it and both hit the target.
I score the number of points shown in each region.
How many different totals can I score?
Friday Puzzle (19/10/2018)
The large square is split into four congruent squares.
Two squares have smaller squares inside them formed by joining the midpoints of the sides.
What fraction of the large square is shaded?
Friday Puzzle (12/10/2018)
A square is split into nine identical squares. Each sides has a length of one unit.
Circles are inscribed in two of these squares, as shown.
What is the shortest distance between the two circles?
Friday Puzzle (05/10/2018)
I have a lock with a three-digit code.
I know all the digits of the code are different and that if I divide the second digit by the third and then square my answer, I will get the first digit.
There are different possible codes.
What is the difference between the largest and smallest possible codes?
Friday Puzzle (28/09/2018)
The diagram shows a sequences of shapes made up of black and white tiles.
Each shape increases by two rows and two columns.
How many black tiles are required for the 10th shape in the sequence?
Friday Puzzle (21/09/2018)
I am thinking of an integer (whole number) that has exactly 8 factors including 6 and 15.
What is my integer?
Friday Puzzle (14/09/2018)
Draw a straight line/s so the shape is split into two congruent halves.
This is a fishy problem.
Friday Puzzle (07/09/2018)
Alex catches between 60 and 90 fish.
She counts them in fours and has 3 fish left over.
She counts them in fives and has 1 fish left over.
How many fish does she catch?