10 Sastry start s working o n a job and works on it for 12 day s and completes 40% of the work.
To help him complete the work, he employs Ravi and together they work for another 12 day s and the
work gets completed. How much more efficient is Sastry than Ravi?
(a) 50% (b) 200% (c) 60% (d) 100%

• Sastry works 12 days n complete 40percent
  for one day=0.4/12
  =0.0333 per day....
  sastry n ravi completes 60percent in 12 days..
  for one day=0.6/12
  =0.05 per day....
  ie r+s=0.05 per day
  we know r=o.o33 per day
  which implies s=.o17 per day...
  per day sastry can complete 0.033 and ravi 0.017th work....
  so sastry is twice efficient as ravi....
  so sastry is 200 percent efficient....ravi is 100 percent efficient....
  Real trick is in question they have asked how much more efficient is sastry than ravi???
  so the answer is 200-100=100 percent!!!
• 12 years agoHelpfull: Yes(28) No(3)
• It is clear that in 12 more days Sastry will work 40 % more work..
  and Ravi work rest 20% of work in these 12 days
  So, simply
  Efficiency of Sastry over Ravi is = 40/20 = 2
  Efficiency percentage = 200%
• 12 years agoHelpfull: Yes(17) No(9)
• Sorry, in the last answer i only calculated the effciency of Sastry and Ravi
  That was 200% for Sastry if 100% is taken for Ravi
  So, Sastry more efficient than ravi = 200-100
  =100%
• 12 years agoHelpfull: Yes(11) No(2)
• in totl 24 days sastry completes 80% of work. . and in 12 days ravi completes 20% of the work.
  now we have to compare both's efficiency. in 12 day sastri can do 40% of work
  question is asking how much sastri MORE efficient than ravi. . so the ans will be 100%.
  sastri is 100% more efficient than ravi. ans d)100
• 12 years agoHelpfull: Yes(10) No(1)
• b is the answer.shastry does 40% work in 12 days,while with ravi 60% work is done in same no. of days.so,ravi does only 20% of work as compared to shastry in 12 days.
• 12 years agoHelpfull: Yes(8) No(6)
• according to me its 50%.......pls post the right ans
• 12 years agoHelpfull: Yes(4) No(10)
• let the total work be w
  so shastri one day's work effieciency is 0.4w/12 i.e=w/30
  they together after 12 days complete the job so shastri again completes 40% of work remaining 20% completed by ravi so its one day work =0.2w/12=w/60
  shastri is twice more efficient than ravi ..so the d/f n efficiency is 100%
• 12 years agoHelpfull: Yes(4) No(0)