Question 507764
It will take 24 men working 9 hours a day each to build a house in 45 days. Given that all men work at the same rate, 
a. How many days will 18 men take to build the same house if they work 8 hours a day ? 
b. how many hours per day must 20 men work if the house is to be completed in 48 days ?
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Man-hours to build the house=24*9*45=9720
a. How many days will 18 men take to build the same house if they work 8 hours a day ?
let x=days to build the same house
18*8*x=9720
x=9720/(18*8)=67.5 days
..
b. how many hours per day must 20 men work if the house is to be completed in 48 days ?
let u = hours per day 20 men must work
20*u*48=9720
u=9720/(20*48)=10.125 hrs/day