Question

in an examination 15% students failed and 425 students passed find the number of students failed in the examination

Answer 1

students who passed = 425
Percentage of students who passed = 100-15
= 85%
So 
85% of x = 425
85/100 × x = 425
x = 425 × 100/85
x = 500
No. Of students who failed = 15% of 500
= 15/100 × 500
= 75