Question 831526
<pre>
There are several ways to approach a problem like this. 
The easiest way is to use the worker-time-job formula, which is:

{{{(W[1]T[1])/J[1]}}}{{{""=""}}}{{{(W[2]T[2])/J[2]}}}

where

W<sub>1</sub> = the number of workers in the first situation.
T<sub>1</sub> = the number of time units (days in this case) in the first situation.
J<sub>1</sub> = the number of jobs in the first situation.

W<sub>2</sub> = the number of workers in the second situation.
T<sub>2</sub> = the number of time units (days in this case) in the second situation.
J<sub>2</sub> = the number of jobs in the second situation.

W<sub>1</sub> = 3             W<sub>2</sub> = 2     
T<sub>1</sub> = 4             T<sub>2</sub> = the unknown quantity 
J<sub>1</sub> = 2             J<sub>2</sub> = 1

{{{(W[1]T[1])/J[1]}}}{{{""=""}}}{{{(W[2]T[2])/J[2]}}}

{{{(3*4)/2}}}{{{""=""}}}{{{(2*T[2])/1}}}

{{{12/2}}}{{{""=""}}}{{{2T[2]}}}

{{{6}}}{{{""=""}}}{{{2T[1]}}}

{{{3}}}{{{""=""}}}{{{T[1]}}}

Answer: 3 days.

Edwin</pre>