SOLUTION: If 20 men can lay 36 m of pipe in 8 hours. How long would 25 men take to lay the next 54 m of pipe

Algebra ->  Finance -> SOLUTION: If 20 men can lay 36 m of pipe in 8 hours. How long would 25 men take to lay the next 54 m of pipe      Log On


   

Question 1199446: If 20 men can lay 36 m of pipe in 8 hours. How long would 25 men take to lay the next 54 m of pipe
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
N, how many workers
R, work rate for 1 worker
T, time of working
W, amount of work
highlight_green%28%28NR%29T=W%29----basic rule


let r be the work rate of any one man, and x be the time asked for.
system%2820r%2A8=36%2C25r%2Ax=54%29


If you divide the second equation by the first equation,..........
%2825x%29%2F%2820%2A8%29=54%2F36
%285%2F4%29%281%2F8%29x=%289%2F9%29%286%2F4%29
%285%2F4%29%281%2F8%29x=3%2F2
x=%283%2F2%29%288%29%284%2F5%29
x=3%2A4%2A4%281%2F5%29
highlight%28x=9%263%2F5%29