Absent pupils

On Monday, three pupils were missing from the class, 12% of the total number of pupils. How many pupils were missing on Wednesday if 84% of all pupils were in school?

Final Answer:

n =  4

Step-by-step explanation:


3 = 0.12 x
n = x-84/100 x

3 = 0.12·x
n = x-84/100·x

0.12x = 3
100n-16x = 0

Pivot: Row 1 ↔ Row 2
100n-16x = 0
0.12x = 3


x = 3/0.12 = 25
n = 0+16x/100 = 0+16 · 25/100 = 4

n = 4
x = 25

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