1.

Ram, Shyam and Mohan can do a piece of work in 12, 15 and 20 days respectively. How long will they take to finish it together?

Answer»

5 DAYS



When A, B and C can do a WORK in x, y and z days respectively. Then, the three of them 

TOGETHER can finish the work in xyz/ x y + y z + x z days 

Therefore, the No. of days taken by them together to finish the whole work 

= 12 × 15 × 20/12 × 15 + 15 × 20 + 12 × 20 

= 12 × 15 × 20/720 = 5 days.



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