Total of 100 people work in an organization. Of which 63 work in office, 57 work in factory and there are none who work outside. Then how many of them work in both?
(a) 10 (b) 25 (c) 18 (d) 20

• (d)20
  
  Explaina: Total people, X = 100
  Works in office, Y = 63
  Works in factor, Z = 57
  Both = (Y+Z)-X
  = (63+57)-100
  = 120 - 100
  = 20
  
  Submitted by Vignesh
• 12 years agoHelpfull: Yes(3) No(0)
• 100=63+57-x
  100=120-x
  X=20
• 4 years agoHelpfull: Yes(0) No(0)
• no of people working in office p(o)=63
  no of people working in factory p(f)=57
  total no of people working in an organization p(o union f)=100
  no of people who work in both p(o intersection f)=?
  therefore, p(o union f)=p(o)+p(f)-p(o intersection f)
  p(o intersection f)=p(o)+p(f)-p(o union f)
  p(o intersection f)=63+57-100
  p(o intersection f)=20
• 4 years agoHelpfull: Yes(0) No(0)