20% of students participated in 100 m race
15% students participated in 200 m race
10% students participated in long jump
5 % participated in all competitions
Total students 780
Find out how many students not participate in the competition
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Answer:
20 + 15 + 10 + 5= 50
100 = 50
1 =50/100
780= 780×50/100
390 students
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