5 skilled workers can build a wall in 20days; 8
semi-skilled workers can build a wall in 25 days; 10
unskilled workers can build a wall in 30days. If a te
am has 2 skilled, 6 semi-skilled and 5 unskilled
workers, how long will it take to build the wall?

• Ans : 15days
  For Skilled
  5 workers --------20 days
  5 workers 1 day work= 1/20
  1 worker's 1 day work= 1/(5*20)
  
  Similarly,
  For Semi-Skilled------
  1 worker's 1 day work= 1/(8*25)
  
  For Unskilled------
  1 worker's 1 day work= 1/(10*30)
  
  For 2 skilled,6 semi-skilled and 5 unskilled
  workers
  One day work= 2*[1/(5*20)] +6*[1/(8*25)] + 5*[ 1/(10*30)] = 1/15
  Therefore no. of days taken= 15
• 8 years agoHelpfull: Yes(32) No(0)
• 2/100+6/200+5/300=40/600
  so 600/40=15
  so 15 days is the ans.
• 8 years agoHelpfull: Yes(3) No(0)
• 5skill working for 20 days,8semi for 25 days and 10 unskilled for 30 days
  5S×20=8SS×25=10US×30
  
  It gives us
  1S=2SS=3US
  TAKE LCM HERE
  LCM IS 6
  S=6 Unit
  SS=3Unit
  US=2Unit
  
  Now find Total work
  Put any one of value ti get TW
  5S×20=5×6×20=600
  
  Now we have Find 2S+6SS+5US working together
  12+18+10=40 unit 1 day
  
  TW=600
  600/40=15 Days
  
  Guys it looks length for explaination but if u try to solve in this way u will get ans for sure within 10 sec if u practice the way I solved above problem
  No need to take Pen and Paper..
  All the best
• 6 years agoHelpfull: Yes(2) No(0)
• 12men.............(18-6)12days
  16men...............?
  m1d1=m2d2
  12*12=16*?
  hence.?=9days
• 7 years agoHelpfull: Yes(0) No(0)
• LCM METHOD
  LCM OF 20,25,30=600unit(total work)
  5 20day 600/20=30unit/day
  8 25day 600/25=24unit/day
  10 30day 600/30=20unit/day
  
  5workers can work 30unit/day ..then 1 worker will do the work 30/5=6unit/day work done by 2 work=2*6=12
  8workers can work 24unit/day ..then 1 worker will do the work 24/8=3unit/day work done by 6 workers=6*3=18
  10 workers can work 20unit/day ..then 1 worker will do the work 30/10=3unit/day work done by 5 workers=2*6=12
  12+18+15=54totoal work done by 2 S,6 SEMIS,5 UN
  600/54=11.1 ANS=11
  
• 7 years agoHelpfull: Yes(0) No(0)
• 15
  5 skilled workers can build a wall in 20 days
  1 skilled worker can build the same wall in 100 days
  Capacity of each skilled worker is 1/100
  
  8 semi-skilled workers can build a wall in 25 days
  1 semi-skilled worker can build the same wall in 200 days
  Capacity of each semi-skilled worker is 1/200
  
  Capacity of 1 unskilled worker is 1/300
  
  Capacity of 2 skilled + 6 semi-skilled + 5 unskilled workers is 2(1/100) + 6(1/200) + 5/300
  = 1/15
• 6 years agoHelpfull: Yes(0) No(0)
• ANS 15
  
  LCM of 100,200 and 300 is 600 then (12+18+10=40)
  
  600/40=15
• 5 years agoHelpfull: Yes(0) No(0)