5 skill worker can build a wall in 20 days,8 semi skill in 25 days,10 unskill in 30 days.If a team of 2 skill ,6 semi skill,5 unskill is to build a wall.Then how many days will they take

a.20
b.18
c.16
d.15

• d. 15
  
  1 day work of 1 skilled worker=1/(5*20)=1/100, 1 semi skilled worker=1/(8*25)=1/200 &
  1 unskilled worker= 1/(10*30)= 1/300
  so 1 day work of 2 skilled, 6 semi skilled & 5 unskilled worker= (2/100) +(6/200) +(5/300) =1/15
  Therefore work will be completed in 15 days
• 10 years agoHelpfull: Yes(5) No(1)
• 1 day work of 1 skilled worker=1/(5*20)=1/100
  1 semi skilled worker=1/(8*25)=1/200 &
  1 unskilled worker= 1/(10*30)= 1/300
  so 1 day work of 2 skilled, 6 semi skilled & 5 unskilled worker= (2/100) +(6/200) +(5/300) =1/15
  Therefore work will be completed in 15 days
• 10 years agoHelpfull: Yes(1) No(0)