SOLUTION: Twelve men would take 15 days to finish a job if each works 8 hours a day. If this job has to be finished in 10 days,find the total number of extra hours that these 12 men must do

Algebra ->  Equations -> SOLUTION: Twelve men would take 15 days to finish a job if each works 8 hours a day. If this job has to be finished in 10 days,find the total number of extra hours that these 12 men must do       Log On


   

Question 959377: Twelve men would take 15 days to finish a job if each works 8 hours a day. If this job has to be finished in 10 days,find the total number of extra hours that these 12 men must do altogether.
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
%2812men%29%288hrs%2Fday%29%2815days%29=1440man-hrs
%281440man-hrs%29%2F%28%2812Men%29%2810days%29%29=12hrs%2Fday
ANSWER: The men must work 12 hrs/day to finish in 10 days.
%2812men%29%2F%288hrs%2Fday%29%2810days%29=960man-hrs
%281440man-hrs%29-%28960man-hrs%29=%28480man-hrs%29
ANSWER: The men must work a total of 480 extra hours.