Answer:
1000 students
Step-by-step explanation:
If 45% failed then 55% passed.
Let the total number of students who appeared in exam be y.
Then:
[tex]55\% \: of \: y = 550[/tex]
This implies that:
[tex] \frac{55y}{100} = 550[/tex]
Multiply both sides by 100 to get:
[tex]55y = 550 \times 100[/tex]
Divide through by 55 to obtain:
[tex]y = \frac{550 \times 100}{55} [/tex]
Cancel out the common factors:
[tex]y = 10 \times 100[/tex]
Simplify to get:
[tex]y = 1000[/tex]
Therefore 1000 students appeared in the exam.
