Question

. In an examination, 80% of the

students passed in English, 85% in

Mathematics and 75% in both

English and Mathematics. If 40%

students failed in both the subject,

find the total number of students.​

Answer 1

Answer:

Hope it helps u ☺️

Step-by-step explanation:

Let the total number of student is x

Number of student passed in both subject is

n(A∪B)=n(A)+n(B)−(A∩B)

Here, n(A)=80% of x

n(B)=85% of x

n(c)=75% of x

∴n(A∪B)=

100

80

x+

100

85

x−

100

75

x

⇒

100

90x

⇒

10

9x

Failed in both subjects

⇒x−

10

9x

⇒

10

x

∴

10

x

=40

⇒x=400

Answer 2

Answer:

200

Step-by-step explanation:

=80+85+75-40

=200

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