Quantitative Aptitude :: Chain Rule - Discussion

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Explanation:
Lets assume x days required to finish the remaining job.

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

Job days
----------------
5/8(d) 10(d)
3/8 x

=> (3/8)/(5/8) = x/10
=> 3/5 = x/10
=> x = 6 days.