1.

A can do a piece of work in 12 days, while B can do it in 8 days with the help of C, they finish the work in 4 days. Then C alone can do the work in

Answer»

24 days



A and B together can do the work in 12 × 8/20 = 96/20 days 

A +B and C together do the work in 4 days. 

Then C alone can do the work in 96/20 × 4/96/20 – 4 days 

= 96/5/16/20 = 96/5 × 20/16 = 24 days.



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