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charle [14.2K]
3 years ago
8

It takes one examiner 15 hours to mark 80 exam papers. How long should it take 5 examiners to mark 80 exam papers​

Mathematics
1 answer:
Fiesta28 [93]3 years ago
3 0

Answer:

It will take <u>3 hours</u> 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 = \frac{80}{15}  papers

In hour 5 examiners can mark = 5\times \frac{80}{15}=\frac{80}{3} papers

So, we know 5 examiners can mark  \frac{80}{3} papers in 1 hours.

So, to mark 1 paper they will take = 1\div \frac{80}{3} = \frac{3}{80} of a paper

Thus, to mark 80 papers they will take = \frac{3}{80}\times 80 = 3 hours.

Thus, it will take 3 hours for 5 examiners to mark 80 papers.

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