A wall can be built by 6 men working 8 hours per day in 5 days. How many days will it take 4 men to build the wall if they work only 5 hours per day??

Question

anonymous · Answer

calculate how much work one man can do per hour.

anonymous · Answer

what did you try?

anonymous · Answer

i got 1 man = 15/4 hours  = 1 day

anonymous · Answer

yes, but what did you do to get that?

anonymous · Answer

6 men = 8/5 hours  = 1 day  then 6/8/5=15/4
1 man = 15/4 hours = 1 days

anonymous · Answer

i meant day

anonymous · Answer

okay. you did it all wrong.

anonymous · Answer

the total work was done by 6 guys in 5 days working 8 hours a day. that means, the total work was done by 6 guys in 40 hours, right?

anonymous · Answer

so, in one hour, 6 guys can do 1/40th of the work.
that means 1 guy can do 1/6th of 1/40th of the total work

anonymous · Answer

or 1 guy can do 1/240th of the total work in one hour.