Quantitative Aptitude :: Time and Work - Discussion

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Explanation:
(A,B and C) 1 day work = 1/10
Work done by (A, B and C) in 4 days = 4*1/10=2/5
Left work = (1?2/5)=3/5

3/5 part of work is done by (B and C) = 10 days.

(B + C)'s 1 day's work = 3/50

So Whole work will be done by (B and C) = (10?5/)3 = 50/3 days.
=> (B+C)'s 1 day work = 3/50
A's 1 day's work = (1/10?3/50)=2/50=1/25

So A alone could complete the work in 25 days.