Question

In a class test 90% of the student passed while the rest failed. If the number of failed students was 3, how many students were there in the class

Answer 1

Answer:

Let the total no. of students be x

Students failed = 90% of x

=9/10x

According to the question

x-9x/10=3

(10x-9x)/10=3

x/10=3

x=10*3

x=30

Therefore, no. of students in the class is 30

Answer 2

The number of student in the class is 30.

In a class test 90% of the student passed while the rest failed. If the number of failed students was 3.

We have to the number of students in the class.

A/C to question,

90 % students of the class passed while the rest failed in the test.

it means, 100% - 90% = 10% of the class students failed in the test.

But number of failed students = 3

∴ 10% of class students = 3

Let the number of class students be x.

⇒ 10% of x = 3

⇒ 10x/100 = 3

⇒ x/10 = 3

⇒ x = 30

Therefore the number of student in the class is 30.

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