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There is only so much preparation you can do for a job interview. And you can steady yourself for the usual questions, such as where do you see yourself in five years, but that prep can only take you so far.

So what would you do if you were asked; How many hours would it take to clean every single window in London? That was one of the 10 toughest questions from the past year compiled by jobs site Glassdoor.

Here are the 10 questions:

1. 'Which magic power would you like to have?' (asked by Topshop)

As with many of these there is no exact answer to the question, it is more a way seeing how quickly and how apt to the role your answer. So while saying the ability to see the lottery results early so you never have to work again might be what you're thinking, an answer that would be pertinent to the role would be better. If you were going for a public relations role perhaps it would be something to do with persuasion, for example.

2. 'If you were a fruit, what kind would you be and why?' (asked by TopdeskTravel)

This seems more like a question to be asking on a speed date than an interview, but like the magic powers it is more to do with matching a fruit to your personality. For example, a pineapple is spiky on the outside and soft on the inside, but again we seem to be trying out for Blind Date.

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3. 'If you could have dinner with three actors that are no longer living, who would you pick?' (asked by Blackberry)

This will tell an interviewer a lot about your interests and hobbies, but without asking in a boring way. When answering explain why you have chosen each actor as that will allow you to reveal your personality.

4.'How many hours would it take to clean every single window in London?' (asked by IBM)

As this is an almost impossible question to answer, especially in the time frame of an interview, it is more about how you would go about working it out. It would be thinking about how you would work out how many windows there are in London by population and businesses, then take a stab at approximate size of window and a guess at the length of time it would take to clean. The answer is really just showing how you would work under pressure.

5.'How do you get an elephant in a fridge?' (asked by Germalto)

Another question that is more about how you would go about working out. You don't know the size of the fridge, so perhaps it could just walk in. And before you go all dark and talk of cutting it up it might be wiser to opt for a comical answer.

6. 'If the time is quarter past three, what is the angle measurement on the clock?' (asked by Standard Bank Group)

If you are asked this in an interview then chances are it should be a job that requires maths and you would know how to answer it. Each hour on a clock is made up of 30 degrees - a clock is 360 degrees, 12 hours, means 30 degrees per hour - and a quarter of an hour is 25% of 30, and therefore 7.5 degrees.

7. 'If you had three minutes alone in a lift with the CEO, what would you say?' (asked by Network Rail)

This is your chance to show you are ready for senior positions, think specific questions to the business and even proffer opinions on how things could be improved.

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8. 'How many people born in 2013 were named Gary?' (asked by BT)

There has been quite a bit of coverage of this in the past year with the name tumbling down the rankings. This question is probably more about seeing if you read the news. If you are guessing but explain the reason for your guess is because you saw in the press it was almost extinct then that is good enough. In fact there were 33 baby boys named Gary in 2014 , an increase of five from 2013.

9. 'What will you be famous for?' (asked by EY)

Another one to answer with the position you are going for in mind.

10. 'How many nappies are purchased per year in the UK?'

As with the windows in London it is more about working it out, such as number of babies born a year, combined with guess at number of nappies used per baby per day times 365.