Question:You?re about to board a train from London to Newcastle. You want to know if it?s raining, so you call your three friends who live in Newcastle. Each friend has a 2/3 chance of telling you the truth and a 1/3 chance of telling you a lie. All three friends tell you that, yes, it?s raining in Newcastle. What is the probability that it is, in fact, raining in Newcastle?
Answer:The answer is 96%.
How:You only need one friend to be telling the truth. So if you calculate the odds of them all lying, that?s 1/3 multiplied together, making 1/27 (1/3 x 1/3 x 1/3). So that?s a 1 in 27 chance that all of your three friends are lying. So, switch that around, and it?s a 26/27 chance one of them is telling the truth ? or 96% ? that it is, indeed raining in Newcastle. Check out other HR-related content:
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Question:You have a 5-litre jug and a 3-litre jug. That?s great, but how would you measure out exactly 4 litres without using any other equipment?
Answer:First, fill the 3-litre jug and pour it into the 5-litre jug. The 3-litre jug is now empty, and the 5-litre jug has 3 litres in it. Now, fill the 3-litre jug again and tip it slowly into the 5-litre jug. You?ll have 2 litres in before the 5-litre jug is full because it already has 3 litres in from before? Now you have 1 litre left in the 3-litre jug and the 5-litre jug is full. Empty the 5-litre jug. Now pour the remaining 1 litre in the 3-litre jug into the 5-litre jug. Lastly, fill up the 3-litre jug again and tip it all into the 5-litre jug, which now ends up with exactly four litres in it!
Question:A snail sits at the bottom of a 30-foot wall. Each hour it can climb three feet, but it then slips down two feet. How long does it take the snail to reach the top?
Answer:The answer is 28 hours. That?s because for the first 27 hours it climbs a net one foot. But in the 28th hour, it reaches the top with its three-foot climb before having the chance to slide down two feet. Robert Scott, managing director at Aaron Wallis Sales Recruitment said: ?Integrating logic based interview questions into a recruitment process can be a great opportunity to see how a candidate thinks on their feet. It isn?t necessarily about getting the answer right but more of a measure to see how they apply logic and question the information provided.
“Too often interviews rely on evaluating the achievements of a person?s past, which is important, but logic-based questions can be a great indicator of how the candidate deals with the problems that are placed in front of them? Read more about UK workplaces:
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