Question

In annual sports 20% of the students took part in 100m race. 15% of the stu-
dents in 200m sprint and 10% of the students took part in the long jump event
,
5% of the students took part in these three events. Let's work out the number of
the students who did not take part in any of the events if the total number of
students of the school were 780. oldal​

Answer 1

Answer:

No. of students take part in 100m race =

$\frac{20}{100} \times 780 = 156$

No. of students take part in 200m race =

$\frac{15}{100} \times 780 = 117$

No. of students take part in long jump event =

$\frac{10}{100} \times 780 = 78$

No. of students take part in these three events =

$\frac{5}{100} \times 780 = 39$

No. of all students who take part in events= 78+39+117+156= 390 students

No. of students didn't take part in any event= 780-390=390 students