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!
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.
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