Question

In an examination 200 students passed in both physics and chemistry and 40% of the class passed in physics and 60% passed in chemistry. If 10% of the class failed in both the subjects then what is the total number of students of the class?

Answer 1

Answer:

In an examination, 34% of the students failed in mathematics and 42% failed in English. If 20% of the students failed in both the subjects, then find the percentage of students who passed in both the subjects.

A.40%

B.42%

C.44%

D.46%

Answer: Option C

Explanation:

Failed in mathematics, n(A) = 34

Failed in English, n(B) = 42

n(A∪B)=n(A)+n(B)−n(A∩B)=34+42−20=56Failed in either or both subjects are 56Percentage passed = (100−56)%=44%

Answer 2

Answer:

100 is the total class srenth of the class