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Let the total number of pupils be x.

If 5/5 is the total (whole) and 4/5 passed the exams, then 1/5 failed:
5/5 - 4/5 = 1/5

1/5 of the total pupils who failed the exams is 18:

(1/5)(x) = 18

(1/5)(x)(5/1) = 18 (5/1)     (multiply both sides of equation by 5/1, the 
                                          reciprocal of the coefficient of x)
x = (18)(5)

x =  90, the total number of pupils who took the exams.

(4/5)(90) = number of pupils who passed

 360/5 = 72, the number of pupils who passed the exams
1 3 1
4/5 pupils=Passed So how many is missing it is 1/5.So this is how you do it.
So 72 pupils passed.
1 3 1
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