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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To the end of January 2020, there are 31 days, to the end of February 2020 there are 60 days (31 + 29).
How many months do we have to go into 2020 for this end of month number to become
a). a square number;
b). a prime number;
c). a triangular number?
The hexagon inside the large triangle is regular.
The area of the large triangle is 180 cm2.
What is the area of the blue triangle?
Jenny has some balance scales and just 4 weights.
She can use the 4 weights to measure any whole number of kilograms up to 40 kg.
What are the 4 weights?
Alison went to the Black Friday sales. She spent half her money on her Dad’s xmas present and a third of her money on her Mum’s xmas present.
Then she spent two-thirds of the money she had left on the cat’s xmas present. The last £3 she spent on a coffee.
How much did Alison start off with?
Lynne, Ian and Edward share a bag of jelly babies.
Lynne and Ian eat 8/15 of the jelly babies.
Edward and Lynne eat 11/12 of the jelly babies.
What is the least amount of jelly babies that Lynne eats?
(Only whole numbers of jelly babies are eaten).
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.