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Puzzle #69: How much of this flag is blue?

22 July 2020

#69 Cutting the flag

 

I have a stripy flag laid out on my desk. The stripes are all of equal width, five of them in total. Because three of the five are blue, I know that three-fifths of the flag is blue. However, I take my scissors out and make two straight, angled cuts at both ends of the flag, one of them at about 45 degrees, the other almost straight across, leaving me with a stripy trapezium. What fraction of this trapezium is blue? Is it more, less or the same as the three-fifths for the original flag?

Answer…

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