Four friends rent a cottage for a total of £300 for the weekend.
The first friend pays half of the sum of the amounts paid by the other three friends. The second friend pays one third of the sum of the amounts paid by the other three friends. The third friend pays one quarter of the sum of the amounts paid by the other three friends.
How much money does the fourth friend pay?
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Cayley Mathematical Olympiad 2020 (2020)
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