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I will explain this choice of question and demonstrate my approach of showing the most forward way to solve this in the interview.

The first thing we need to realise that the cost of the trip is going to be split between 5 people (Jill + 4 friends). As they are all sharing the cost of the trip equally, we need to find the total cost ...

This is a quadratic equation and there are three ways to solve one. This question specifies that the answer should be left to three decimal places. This tells you that you can not factorise, as your...