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Squares and right angles

Can you make two squares and four right-angled triangles using only eight straight lines?

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The digits and square numbers

All the nine digits are arranged here so as to form four square numbers: 9, 81, 324, and 576. How would you put them together so as to for...
The llama race

Recently, while I was in a holiday resort in Peru I watched a very interesting spectacle. Two gentlemen by the name of Sr. Guittierez and Sr...
The arithmetical landlady

While house hunting in London, I came across a very good base hold property. Discussing the lease the landlady told me: “The property was or...
Bicycle thieves

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Squares within square

In the illustrations below, how many squares are there?
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I have three square boards, the surface of the first containing five square feet more than the second, and the second containing five square...
The hour hand and the minute hand

We all know that the hour hand and the minute hand on a clock travel at different speeds. However there are certain occasions when the hands...
The long tunnel

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The counterfeit note

While walking down the street, one morning, I found a hundred rupee note on the footpath. I picked it up, noted the number and took it home....

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