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Count by adding Brainteaser

by David, 3 August 2020 | 4 comments

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Difficulty: Fun I’m thinking of three numbers. They are consecutive counting numbers. When you add the first two numbers together, you get the third number. What numbers am I thinking of?

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Two birthday brainteasers Brainteaser

by David, 22 July 2020 | 1 comments

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Difficulty: Tricky Ari was 10 on her last birthday, and will be 12 on her next birthday. How can this be true? Lachlan was 8 on his last birthday, and will be 12 on his next birthday. How can this be true?

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Crystal strength testing brainteaser Brainteaser

by David, 8 July 2020 | 4 comments

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Difficulty: Taxing Terri’s destructive testing lab is very popular. The most important piece of equipment is an electric-powered ram that smashes into samples to see how tough they are. It’s powered by capacitors, and by changing the number of capacitors that are plugged in, Terri can control how powerful the ram is.

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Crowded corridor brainteaser Brainteaser

by David, 24 June 2020 | 3 comments

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Difficulty: Fun The extension is finished! Five new classrooms have been added to the main building. But there’s a problem. The corridor to the new classrooms is very busy. When the bell goes, lots of students stream out of the extension, while others rush in. It gets really crowded!

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Dolly’s cheese brainteaser Brainteaser

by David, 10 June 2020 | 4 comments

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Difficulty: Tricky Dolly bought a special cheese. It comes in a square block that’s 5 centimetres wide, 5 centimetres deep and 5 centimetres tall. It’s also coated in wax on all sides. Without removing the wax, Dolly cuts the cheese into 1 centimetre cubes. Can you work out how many cubes have wax on them?

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Brull family brainteaser Brainteaser

by David, 27 May 2020 | 2 comments

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Difficulty: Fun Ash and Stacy Brull have five daughters. Each of their daughters has one brother. How many people are there in the Brull family?

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Drain the dam brainteaser Brainteaser

by David, 12 May 2020 | 0 comments

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Difficulty: Taxing Water engineers want to empty a dam to do repairs. There’s a creek running into the dam, which will keep filling the dam, unless they install pumps to empty that water. Each pump could empty a swimming pool in a week.

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Fast folding brainteaser Brainteaser

by David, 29 April 2020 | 0 comments

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Difficulty: Fun Aoi is a very consistent origami artist. It takes her two minutes and 23 seconds to fold one crane. Without using a calculator, or even a pen and paper, can you work out how long it will take her to fold 60 cranes?

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Tricky cycles Brainteaser

by David, 15 April 2020 | 0 comments

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Difficulty: Fun Tommy’s part of a group that’s out breaking the rules. They’re going for a ride together instead of social distancing. Each member is on their own vehicle. Some of them are riding bikes and some are riding trikes, with three wheels instead of two. If there are 22 riders and 47 wheels, how…

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Spotlight spin Brainteaser

by David, 1 April 2020 | 0 comments

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Difficulty: Taxing Gillian is running the lights for a big musical. The spotlight has a rotating circle of six frames that she puts filters (like cellophane) in, allowing her to change the light’s colour.

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