Brain-Teaser 490

From The Sunday Times, 18th October 1970 [link]

Tom, Dick and Harry took a test in each of five subjects. Each test was marked out of a total of 40. In grand total each boy obtained half-marks, and no boy scored the same mark in two or more tests.

Each boy’s best and third-best marking totalled one-fifth more than the total of his best and fourth-best, and each boy’s worst mark exceeded 10.

The aggregate of the three boys’ marks in each of four subjects was the same, the highest single mark going to Tom. The second-highest was scored by Dick in the remaining subject.

How many marks did Harry get in that subject?

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