Losing weight

This puzzle is based on one used by Mensa, the high IQ society, in its IQ tests. This one's not particularly tough, but it is nicely confusing. Don't let a little confusion discourage you!

The puzzle

If seven footballers can lose a total of 10kg in weight in 8 hours of training, how many more footballers would be needed to lose a total of 10kg in only 4 hours of training provided the new footballers shed weight only half as fast as the original seven.

Click here for the solution.

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