in an examination 50 percentage of the students passed in mathematics and 70 percentage of students passed in Science while 10 percentage students failed in both subjects 300 students passed atleast one subject find the total number of students who appeared in the examination, if they took examination in only two subjects.
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50% passed mathematics ⇒ 50% failed
70% passed science ⇒ 30% failed
10% failed in both mathematics and science
Those who failed only in maths = 40%
Those who failed only in science = 20%
Those who passed in at least one subject = 100 - (40+20)
= 40%
40% = 300
100% = (100x300) / 40
= 750
The total number of students who appeared for the examination = 750
70% passed science ⇒ 30% failed
10% failed in both mathematics and science
Those who failed only in maths = 40%
Those who failed only in science = 20%
Those who passed in at least one subject = 100 - (40+20)
= 40%
40% = 300
100% = (100x300) / 40
= 750
The total number of students who appeared for the examination = 750
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