Question

These questions are based on the following information
in a class of 150 students, 70 students passed in Physics and 90 passed in Statistics. 10 students
failed in both the subjects.
Question: What percentage of students who passed in at least one subject, failed only in Statistics?​

Answer 1

let be the no of students passed in one subject be x

150-(70+90+10)=x

150-170=x

-20=x

the total no of students passed in one subject is 20

To find the percentage of 20

we should divide the number by 100

therefore,

100÷-20 is 5%

dont confuse this, in above -20 is there but we shouldn't add the - minus sign while changing into % . after changed to % dont add minus sign. while, other formations we using means ( without using percentage formulae) we should add minus sign.

dont confuse it

ok va

Answer 2

5% of students passed in at least one subject and failed only in statistics.

Given,

Class of 150 students.

70 students passed in physics.

90 students passed in statistics.

10 students failed in both subjects.

To Find,

percentage of students who passed in at least one subject, failed only in Statistics.

Solution,

Class of 150 students, 10 students failed in both subjects

So,

= 150 - 10

= 140.

Overall 140 students passed in both subjects.

Now,

The students passed in physics + students passed in statistics - students passed in both subjects.

= 70 + 90 - 140

= 160 - 140

= 20.

100/20 = 5%.

5% of students passed in at least one subject and failed only in statistics.

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