Respuesta :
Answer:
It will take 3 hours for 5 examiners to mark 80 papers.
Step-by-step explanation:
Given:
Time taken by an examiner to mark 80 exam papers = 15 hours
To find time taken by 5 examiners to mark 80 exam papers.
Solution:
Applying unitary method.
One examiner takes 15 hours to mark 80 exam papers
So, in one hour he can mark = [tex]\frac{80}{15}[/tex] papers
In hour 5 examiners can mark = [tex]5\times \frac{80}{15}=\frac{80}{3}[/tex] papers
So, we know 5 examiners can mark [tex]\frac{80}{3}[/tex] papers in 1 hours.
So, to mark 1 paper they will take = [tex]1\div \frac{80}{3}[/tex] = [tex]\frac{3}{80}[/tex] of a paper
Thus, to mark 80 papers they will take = [tex]\frac{3}{80}\times 80 = 3[/tex] hours.
Thus, it will take 3 hours for 5 examiners to mark 80 papers.
