Question

Please explain step by step
The ratio of fail and Paas in a school exam is 2 : 9. if 81 students passed the exam. then the number of failed students are?

Answer 1

Answer:

Let, no. of students passed = 8x

So, students failed = x

Now, total students = 8x + x = 9x

ATQ, case-2

Total students = 9x - 10

Passed = 8x + 30

Fail = ( 9x - 10 ) - ( 8x + 30 ) = x - 40

Now, ( 8x + 30 ) / ( x - 40 ) = 15 / 1

8x + 30 = 15x - 600

7x = 630

x = 90

9x = 810