Question

3/4 of students passed an examination .8 students failed .how many students passed the examination

Answer 1

total-pass=failed 1 - 3/4 =8 1/4 =8 1=8*4 1=32 students pass students=total-fail =32-8 =24 students

Answer 2

we know that,total-pass=failed
therefore,1 - 3/4 =8
1/4 =8
1=8*4
1=32
total students = 32
Fail students= 8 
students pass students=total-fail =32-8 =24 students
Therefore,24 students pass