Question

In an examination 50% of the students passed in mathematics and 70% of students passed in science while 10% students passed in atleast one subject. find the total of number of students who appeared in the examination if they

Answer 1

50 % students passed in Mathematics

70 % students passed in Science

10 % of the total students failed in both subjects and 300 students passed in at least one subject.

Let x be the total number of students.

Total students = 100 %

Passed students = 100 - 10 (failed in both subjects)

= 90

Total passed students in at least one subject = (50 + 70) - 90

120 - 90

= 30 %

So, 30 % of the total students passed in at least in one subject.

⇒ (x*30)/100 = 300

⇒ 30x/100 = 300

⇒ 30x = 300*100

⇒ x = 30000/30

⇒ x = 1000

So, total 1000 students appeared in the examination.

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Answer 2

Answer:

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