1. “Can you calculate how many tennis balls are used during the course of Wimbledon?” Asked at Accenture.
  2.  “Estimate the total number of cars in the UK.” Asked at Barclays Investment.
  3. “How many calories are in a grocery store?” Asked at Google.
  4. “How would you sell a fridge to an eskimo?” Asked at Harrods.
  5. “What would you take to a lonely island with you and why?” Asked at Urban Outfitters.
  6. “Is batman a super hero?” Asked at AlphaSights.
  7. “What cartoon character would you be and why?” Asked at ASDA.
  8. “You have 17 red and 17 blue balls, and you remove 2 at a time. If the two are the same colour, add in one extra blue ball. If they are different colours, add in an extra red ball. What colour is the final ball removed?” Asked at Geonomics.
  9. “What is the wildest thing you have done?” Asked at Metro Bank.
  10. “What was your opinion of the film Blair Witch Project?” Asked at Jefferies & Company.

Source & Answers: https://www.glassdoor.co.uk/Tough-Interview-Questions-UK-LST_KQ0,28.htm