Easy — logic-grid deduction puzzle
Six pupils took their turns at the long jump one after another on a September sports day in 1957, each after a different number of practice jumps.
It was the first week of the school year in Leeds, September 1957, and the school held its sports day under a warm late-summer sun. The sycamores round the field were just turning yellow, and the pupils wore vests and plimsolls. Six pupils reached the long-jump final. The run-up was a single narrow strip, so they jumped one at a time, in turn. Over the summer holidays, each had made a different number of practice jumps. The games master kept a neighbour tally for every pupil: the practice jumps of the pupil who jumped just before and the pupil who jumped just after, added together. The pupils at the two ends of the order had only one neighbour, so their tally was that one pupil's practice jumps. Then a gust snatched the games master's list off the bench and dropped it in the sandpit, and the rake went straight over it. Now the order had to be worked out again.
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Logic grid puzzles: how to solve them, with a worked example