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Brain Teaser – Diamond Opportunity? – THE ANSWER

The Question

Missed the question? Check it out here or go straight for the answer:

The Answer

Easy when you know… You create a new batch by taking a different number of diamonds from each batch. One from the first, two from the second, three from the third…and so on until you take ten from the tenth batch – a total of 55 stones. You then weigh your new batch. The key is how much lower this reading is than you would have got if you had been weighing genuine diamonds only. Let’s imagine that the difference between the reading you expected and the reading you got was 4mg. Each fake diamond weighs 1mg less than a genuine stone so your batch of 55 must contain 4 fakes. If you made up your batch of 55 as described above, the fake stones must come from batch 4. So by knowing the weight difference you know which batch holds the fakes. Easy!

David Wright

David Wright

I combine professional marketing qualifications and experience with a solid understanding of real business to discuss and advise on building business relationships and market awareness, generating leads using effective marketing communication in a down-to-earth, no jargon way. As well as discussing plans and strategies I am keen to 'get my hands dirty'. I work with my clients to make sure things happen! I also have a good understanding of the technical/web aspects of marketing which clients find a real benefit. Technology is a means, NOT an end. My focus is working with business owner/managers, £500K to £10m turnover, to plan, implement and sustain effective market communication and brand awareness as a platform for targeted sales development and business growth.
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