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If we check the sum of percents, we will find: 15+20+35+30+25=125 %. It means that some of the athletics take part in several events. For example, if 25% of the atletics take part in relay races and ran the 100-m sprint, we will get the correct amount of percents since we must subtract the percent of the intersection of the sprint's athletics and relay races from the sum, that is, 15+20+35+30+25-25=100%.