Quantitative Aptitude :: Chain Rule - Discussion

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Explanation:
Lets assume x day need to complete the work.

Note: (u) means up arrow and (d) means down arrow.

men work days
---------------------
36(u) 1(d) 18(d)
27 1 x

(36/27 * 1) = x/18
=> x = 36/27 * 18 = 24 days.