36 men can complete a work in 18 days.In how many days will 27 men complete same work

a.24 days
b.12 days
c.30 days
d.42 days

• a. 24 days
  
  1 man, 1 day work= 1/(18*36)
  27 men, 1day work=27/(18*36) =1/24
  So 27 men will complete the work in 24 days
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