a does 20% less work than b.if a can complete a piece of work in 15/2 hours,then b can do it in how many hours?

• Ratio of percentage of work done by A and B = 80 : 100
  Suppose B takes 'x' hours time to complete the work.
  So,
  ⇒ 80 : 100 :: x : 15/2
  ⇒ 100x = 15/2*80
  ⇒ x = 600/100
  ⇒ x = 6 hours (Time taken by B)
• 7 years agoHelpfull: Yes(6) No(1)
• a=b-(20/100)*b=4b/5
  in 1 hr A does 2/15 work
  in 1 hr B does (5/4)*(2/15) work=1/6 work
  therefore B takes 6 hrs
• 7 years agoHelpfull: Yes(3) No(0)
• 4/5 = b's work time/15/2 or 4/5 = 2(b's work time)/15 => b's work time = 6 hrs
• 7 years agoHelpfull: Yes(1) No(0)
• B=A+A*20%
  B=15/2+15/2*20/100
  B=9hr
• 7 years agoHelpfull: Yes(0) No(6)
• let efficiency of a and b are a and b respectively then a/b=4/5
  now a*15/2=5/4a*x
  x=6 hours answer
• 5 years agoHelpfull: Yes(0) No(0)