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Two candles brainteaser Brainteaser

by David, 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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Five makes 80 brainteaser Brainteaser

by David, 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, 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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Too many elevens brainteaser Brainteaser

by David, 16 June 2022 | 2 comments

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How many 1s does it take to write out the number eleven thousand, eleven hundred and eleven?

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Paying the miller brainteaser Brainteaser

by David, 2 June 2022 | 2 comments

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A farmer goes to the local mill to get some wheat ground into flour. The miller doesn’t ask for money – instead, they take one tenth of the wheat as payment. If the farmer wants 100 kilograms (kg) of flour at the end, how much wheat should they bring?

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Srinivasa’s street brainteaser Brainteaser

by David, 18 May 2022 | 0 comments

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Difficulty: Extreme! Srinivasa lives in a house on a short street, with houses on one side. The houses are numbered 1, 2, 3 and so on. He was practicing his addition when he noticed something strange.

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Solo noughts and crosses brainteaser Brainteaser

by David, 5 May 2022 | 0 comments

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Difficulty: Tricky Mabel wanted to play noughts (O) and crosses (X), but she didn’t have anyone to play with. So she just took one go after another. Somehow, Mabel put Xs in 6 of the 9 squares without making a line of 3 Xs. Can you draw the board and work out which squares have…

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Counting steps brainteaser Brainteaser

by David, 13 April 2022 | 0 comments

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Difficulty: Tricky Willow has a staircase with 7 steps. She likes to walk down the staircase in different ways. Sometimes she takes 1 step at a time, and other times she skips a step and goes 2 at a time. If Willow mixes up these 2 types of steps, how many different ways can she…

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Oranges brainteaser Brainteaser

by David, 24 March 2022 | 0 comments

several wooden crates overflowing with oranges

Difficulty: Extreme! These 2 brothers sold oranges for a living. On Monday: Josh priced his oranges at 2 for $3. He sold 30 oranges for $45. Zach priced his oranges at 3 for $4. He sold 30 oranges for $40. On Tuesday, they combined their prices, and sold their oranges in groups of (2 +…

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Jasper’s shapes brainteaser Brainteaser

by David, 9 March 2022 | 0 comments

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Difficulty: Tricky Jasper had a regular (sides and angles all the same) hexagon with 10-centimetre sides, and 3 regular triangles with 10-centimetre sides. He put the side of a triangle against every second side of the hexagon. How many sides did this final shape have?

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