Question

In a exam,80% students passes English and 70% Students passes in maths and 10% fails in both.If 144 student passes in both subjects.Then find the total students appear in the exam?

Answer 1

Step-by-step explanation:

Let total number of students be x

then

n(U)=x

n(E)=80%x

n(M)=70%x

n(E U M)= n(E)+n(M) - n(M n E)

n(U-(M u E))= 10%x

n(U)-n(U n (M u E))=10%x

n(U)-n(M u E)=10%x

x-(144)=10x/100

x-x/10=144

9x/10=144

x=144×10/9=360

total number of students =360