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'Weekly Problem 7 - 2006' printed from http://nrich.maths.org/

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It takes four gardeners four hours to dig four circular flower beds, each of diameter $4$ metres.

How long will it take six gardeners to dig six circular flower beds, each of diameter six metres?
 
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.

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