SOLUTION: To finish construction at a site, it would take 4 bulldozers and 3 shovels 2 days, and it take 5 bulldozers and 1 shovel 3 days. How many days does it take 1 bulldozers and 1 shove

Question 903859: To finish construction at a site, it would take 4 bulldozers and 3 shovels 2 days, and it take 5 bulldozers and 1 shovel 3 days. How many days does it take 1 bulldozers and 1 shovel?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Call the construction 1 job
--------------------------
Let = the rate of working
of a bulldozer in jobs / hour
--------------------------
Let = the rate of working
of a shovel in jobs / hour
--------------------------
(1)
(2)
--------------------------
Multiply both sides of (2) by
and subtract (1) from (2)
(2)
(1)
---------------------------

and
(2)
(2)
(2)
(2)
(2)
---------------------

days
------------------
It takes 1 bulldozer and 1 shovel 6.6 days
check:
(1)
(1)
(1)
(1)
------------------------
(2)
(2)
(2)
(2)
Ok
Hope I got it

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