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## Dust mite dilemma brainteaser Brainteaser

by David, 31 March 2021 | 0 comments

This brainteaser comes from our new book, Puzzles and Projects. This book features some of the best puzzles, hands-on activities, stories and more from Double Helix magazine. Plus, there’s stacks of new content to explore! You can buy a copy on the CSIRO Publishing website, or pick it up from your favourite bookstore!

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## Giant golden cube brainteaser Brainteaser

by David, 12 March 2021 | 4 comments

Difficulty: Tricky Sian is making a big, shiny cube in Minecraft. It will be 10 blocks wide, 10 blocks deep and 10 blocks high. The outer layer of blocks will be made of gold. Everything inside the cube will be made of obsidian. Will Sian need more gold blocks, or more obsidian ones?

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## Mirror ages brainteaser Brainteaser

by David, 3 March 2021 | 3 comments

Misrak was looking at the birthdays in her family. After a bit of maths, she realised that her father’s age and her grandfather’s age had the same digits, but swapped. When she added their ages together, she got 121. Her grandfather was aged between 20 and 40 when her father was born. Can you work…

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## Star maze brainteaser Brainteaser

by David, 17 February 2021 | 0 comments

Difficulty: Tricky Ollie the space octopus is lost! She’s trying to get back to her home planet – the blue circle – and she needs some help. Ollie’s spaceship has special engines. They cause the spaceship to fly in a straight line, but whenever they hit a yellow star, they must make a right-angle turn….

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## Adding on dice brainteaser Brainteaser

by David, 21 January 2021 | 0 comments

Difficulty: Fun How well do you know your dice? A standard dice is a cube with six sides. Each side is numbered with a different number from 1–6. Most six-sided dice also have a special trick in the way they are numbered. If you add the number on the top and the number on the…

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## … and one and a half brainteaser Brainteaser

by David, 7 December 2020 | 0 comments

Difficulty: Extreme I’m thinking of a number. When you add one and a half to it, you get the same result as if you multiplied it by one and a half. What’s the number I’m thinking of?

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## Triangular truss brainteaser Brainteaser

by David, 25 November 2020 | 0 comments

By Rok Willesee Difficulty: Fun An engineer has asked you to help him count the number of triangles in this roof truss. He thinks there are five, but his boss thinks there are more. How many triangles can you see?

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## Sharing beans brainteaser Brainteaser

by Fiona, 11 November 2020 | 0 comments

Difficulty: Tricky Abelina and Ben bought a bag of jelly beans, and decided to split it. When they shared the jelly beans out, they split evenly and there wasn’t any remainder.

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## Shape weighing brainteaser Brainteaser

by David, 28 October 2020 | 0 comments

By Rok Willesee Difficulty: Tricky A scientist was looking back at notes they made about their experiments. Unfortunately, in one experiment the scales didn’t work. Can you help them work out what the weight should be in the final experiment?

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## Two eggs brainteaser Brainteaser

by David, 14 October 2020 | 3 comments

Difficulty: Taxing Jenny found a strange sum written on a piece of paper: EGG + EGG = PAGE Each letter represents a different digit, so P might be 1, for example. Can you work out what the sum really is?

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