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Alien academy brainteaser Brainteaser

by David Shaw, 9 November 2022 | 0 comments

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Difficulty: Tricky A new class of aliens is due to start at Alien Academy. The teachers need to know the age of each alien, but can’t contact them. Luckily, they have a few clues to help them. There are five aliens (Filp, Agg, Nim, Phod, and Mex) and each alien is a different age (7,…

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Who lives next door? A brainteaser Brainteaser

by David Shaw, 19 October 2022 | 1 comments

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Difficulty: Tricky There are 4 houses that stand in a row. One family lives in each house. The O’Connells live next door to the Taos, but they don’t live next door to the Sosas. The Prasads don’t live next door to the Sosas. Who lives next door to the Prasads?

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Growing dough brainteaser Brainteaser

by David Shaw, 6 October 2022 | 2 comments

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Difficulty: Extreme! Nguyệt keeps a bread dough in her fridge. She tends to it so that every day it doubles in size, and then every morning, she cuts off enough dough to make one loaf of bread for her breakfast.

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My favourite book brainteaser Brainteaser

by David Shaw, 23 September 2022 | 0 comments

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Difficulty: Fun On my bookshelf, my favourite book is the third from the left, and it’s the seventh from the right. How many books are there on that shelf?

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When clock hands meet brainteaser Brainteaser

by David Shaw, 24 August 2022 | 2 comments

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For an entire day, Ruth watched a dial clock, looking for when the hands met. She wrote down all the times they met. Which hour did the hands not meet?

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Sneaker discount brainteaser Brainteaser

by David Shaw, 11 August 2022 | 0 comments

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Billie is really in to sneakers and is aiming to sell them for a profit. Work out if Billie made money, lost money, or sold the sneakers at their original price.

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Two candles brainteaser Brainteaser

by David Shaw, 27 July 2022 | 3 comments

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Barry has 2 candles that are both 60 centimetres long. One will last for 1 hour, and the other will last for 2 hours.

Barry lights both candles at the same time. Later, he blows them out at the same time.

The next day, Barry realises that one of the candles is half the length of the other.

Assuming they both burnt evenly, how long were they burning for?

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Try a tangram Activity

by David Shaw, 20 July 2022 | 0 comments

a duck shape made of smaller shapes

This traditional Chinese puzzle, known as a tangram, reveals some surprising properties of squares!

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Five makes 80 brainteaser Brainteaser

by David Shaw, 13 July 2022 | 2 comments

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Can you find 5 consecutive (counting upwards) numbers that add up to 80?

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Two trains brainteaser Brainteaser

by David Shaw, 29 June 2022 | 0 comments

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Difficulty: Fun A fast passenger train leaves Sydney Central station, headed for Broken Hill. At the same time, a slow freight train, moving at only half the speed of the passenger train, leaves Broken Hill station, headed for Sydney Central. When they meet, which train is closer to Sydney?

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Double helix cover

Double Helix

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