Question

in an examination 72% of the total examinees passed if the number of failures is 392 find the total number of examinees

Answer 1

listen I have lacked of time so I can't give you full answer but I show you a format.
let the total examine to be x.

so

x of 28%= 392
x=392×100÷28
x= your answer !!

Answer 2

If 72% students are passed then failures students are (100-72=28%) and total failure are 392 that's why 28% = 392 then,
100%=392/28×100 =1400 if you want to passed students then (1400-392=1008).