Quote:
Originally Posted by RMKamran
Aoa,
Kindly solve this question. In this question, two different people are doing the same work, and this is confusing me in its solution 
If 3 men or 6 boys can do a work in 20 days, then 6 men and 8 boys shall take:
A. 6 days.
B. 8 days.
C. 9 days.
D. 20 days.
P.S: Quick and detailed reply would be highly appreciated. Thanks in anticipation.
Regards. |
1 Man = 2 Boys
Total Boy-days required to complete the task = 6 boys x 20 days = 120 Boy-days
120 days are required by one boy to complete the task.
Now come to the 'then' part.
because
6 men = 12 boys
therefore,
6 men + 8 boys = 12 boys + 8 boys = 20 boys
Now days required to complete the task = 120 boy-days /20 boys = 6 days
120 days are required by one boy to complete the task so the days required by 20 boys will be 120/20 = 6 days.
You can also solve by pursuing with the men instead of boys, i.e. 1 man = 2 boys.