Latest Infosys Aptitude Question SOLUTION: 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 se

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(#M40152772) INFOSYS Numerical Ability question Keep an EYE

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?

Asked In Infosys sandiip roy (8 years ago)

Unsolved Read Solution (7)

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Read Solution (7) :

Supriya Kumari  (8 years ago)

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

Is this solution Helpfull? Yes (32) | No   

Raghvendra Sharma  (8 years ago)

2/100+6/200+5/300=40/600
so 600/40=15
so 15 days is the ans.

Is this solution Helpfull? Yes (3) | No   

Hanumante Anil   (6 years ago)

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

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indu  (7 years ago)

12men.............(18-6)12days
16men...............?
m1d1=m2d2
12*12=16*?
hence.?=9days

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mansi  (7 years ago)

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

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Puja singh  (6 years ago)

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

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Sudarshan Rathod  (5 years ago)

ANS 15

LCM of 100,200 and 300 is 600 then (12+18+10=40)

600/40=15

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