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

Three students each picked 4 different numbers under ten, and then multiplied these numbers together.

They all had the same answer, even though they didn’t all pick the same set of numbers. No negative numbers were used.

How?

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Friday Puzzle (11/06/2021)

A wooden box measures 2 m by 3 m by 4 m and weighs 10 kg when empty.

What can you put in the box so that it weighs 8 kg?

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Friday Puzzle (04/06/2021)

Beth bought a bag of sweets on Monday, and ate a quarter of them.

On Tuesday she ate a third of the remaining sweets.

On Wednesday she ate half of the remaining sweets.

On Thursday she ate five of the sweets.

On Friday she noticed that she only had three sweets left.

How many sweets were originally in the bag?

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Friday Puzzle (28/05/2021)

A car travels at 60 km per hour over a certain distance, and then returns over the same distance at a speed of 40 km/h.

What is the average speed for the trip?

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Friday Puzzle (21/05/2021)

A 40 kg brittle metal weight was used to weigh things on a balance scale. The weight was dropped and it broke into four pieces.

Using combinations of the four pieces all the whole number weights from 1 kg to 40 kg can be weighed on the balance scale.

What is the weight of the largest piece?

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Friday Puzzle (14/05/2021)

The numbers

48, 16, 20, 15, 72, 24, 90, 10, 30, 36, 8, 45

are grouped in pairs so that the product of each pair is the same.

What number is paired with 10?

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Friday Puzzle (07/05/2021)

4!   -   said four factorial, means 4 × 3 × 2 × 1.

Without working out the value, how many zeros will there be at the end of 25! (twenty five factorial) ?

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Friday Puzzle (30/04/2021)

a + b + c + d = 20

ab + c + d = 4

a + bc + d = 16

a + b + cd = 12

 

Find the values of  a, b, c and d.

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Friday Puzzle (23/04/2021)

I have 77 socks in a drawer.

I have 18 identical yellow socks, 34 identical black socks and 25 identical green socks in the drawer.

It’s night, the lights have gone out and I can’t see.

What is the minimum number of socks I must take out to be certain to have a pair of each colour?

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Friday Puzzle (16/04/2021)

What is the largest 3-digit number that is a multiple of 6, that has the digits 6 and 5 in it?

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