Chain Rule Practice Test 1 with solutions

Question : 5 of 40

Marks: +1, -0

If 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day; for how many hours a day would 4 examiners have to work in order to examine twice the number of answer books in 30 days?

Validate

Solution:

Examiners	Work	Days	Hours
9	1	12	5
4	2	30	x

⇒

x/5

{12}/{30} × 2/1 × 9/4

∴ x =

{12}/{30} × 2 × 9/4 × 5

= 9 hours

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