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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A kilometre-long train travelling at 60 km/h enters a kilometre long tunnel.
How long does it take for the entire train to pass through the tunnel?
Chris and Danny have brought in biscuits.
if Danny gave him 4 of his biscuits they would have the same number,
but if Chris gave Danny 4 of his biscuits Danny would have 3 times as many.
How many biscuits has Danny brought in?
Harry Hotelier has mixed up the nine keys to his nine bedrooms.
What is the maximum number of times Harry needs to try a key in a door to sort out which key opens which door?
Hint: Once he finds a key to a door he leaves the key in the door.
Daisy the cow moo..ves round the outside of her field at 3 km/h.
She then moo..ves round the outside of her field a second time at 6 km/h.
What is her average speed over the course of the two circuits?
Two teachers scramble for the glue.
Mr Smith grabs three lots of glue and Mrs Robson grabs two lots of glue.
Mr Smith has exactly twice as much as Mrs Robson.
Which glue wasn’t used?
By adding plus signs between the numbers 9 8 7 6 5 4 3 2 1 make 99 in two different ways!
8000 is 20^3.
It is also the sum of four consecutive cubic numbers.
Find these four cubic numbers.
How can you ADD eight 8s to get the number 1000?
Replace letters with digits so the sum is true.
There are quite a few solutions.
What is the smallest prime number that will divide exactly into
3333 + 7777 ?