M4maths Previous Puzzles

13 Sep 2016 Man at work

Six men do a piece of work in 10 days with an effort of 6 hours per day. How many extra men are required for doing the work of double strength in 4 days with an effort of 5 hours per day

OPtion

1) 2
2) 3
3) 1
4) 4
5) 5
6) 6
7) 7
8) 8
9) 9
10)0

Solution

We know that for the question, the best shortcut is
Work * no. of men * days * hours = constant
1 * 6 * 10 * 6 = 2 * x * 4 * 5
360 = 40 x
x = 9
Hence no. of extra men required are 3

Option 2)

Correct Option: 2 Best Solution (12)

Avinash Singh   8 years AGO

1 man's work in hour = 1/360
now double strength= 1/180
In 20 hours, men required = 180/20=9
Hence 3 extra men. option 2) 3

Like? Yes (1) | No   

phanikumar   8 years AGO

6*6*x*10=y*2x*5*4 that is equal to 9 so 9-6=3 so we required extra 3 men's

Like? Yes (1) | No   

G.S.Kantharao   8 years AGO

The men Required = 6*(6/5)*(10/4)*(1/2) = 9
The excess noumber required is 9 - 6 =3
Hence the right choice is 2

Like? Yes (1) | No (1)  

Gokulapriya    8 years AGO

10:4(days indirect propotitional)
6:5(hrs indirect)
1:2(strength direct)
6:x
10*6*1*6=4*5*2*x
x=9
9-6=3
so our option 2 is the answer

Like? Yes | No   

sachin soni   8 years AGO

Work of double strength means the capacity of each man doing work doubles.
hence applying man_days c oncept we get
6*6*10=5*4**2*m
=>m=9
hence extra men are 3
hence option 2 is correct.

Like? Yes | No   

payal   8 years AGO

as per question 6 men work 6 hours each day n complete work in 10 days
as 1 hour 1 day work will be ..1/60
we want work to be completed in 4 days plus 5 hours each day so.....i.e 1/20...so...no. of men required will be 3....

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JENSI KARUNYA.S   8 years AGO

6*10*6=X*4*5
X=18
a boy work with double strength.so 18/2=9 boys is required
the extra boys=9-6=3 boys

Like? Yes | No   

Shubham Kumar   8 years AGO

6*6*10*1 = 4*5*2*M
M=9
so 3 men more will be required

Like? Yes | No   

gulshan   8 years AGO

6*10*6*1(efficiency)=2(effici)*4*5*x
x=9
9-6=3(extra men)

Like? Yes | No (1)  

Mukund Manohar   8 years AGO

360 = 40*x
=> x = 9
Required number of extra men = 9 - 6 = 3

Like? Yes | No (1)  

surendra yalamarthi   8 years AGO

6 men do a work in 10 days by working 6 hours per day i.e., each men work for 60 hours. now the same work in 4 days by working 5 hours per day i.e.,20 hours by each men
no. of men=(6*20)/60=2 men

Like? Yes | No (1)  

PRABHAT KUMAR   8 years AGO

6*6*10=[(6+x)*4*5]/2
x=30
extra man 30
option 2

Like? Yes | No (2)