Question on work done by #x# machines in some days?
Given that the initial estimated count of machines be
Given that the adjusted count of machines is
Given that the new count of days to complete the task is 12 days.
Let the amount of work be measured in 'machine days'.
So the amount of work to complete the work is:
Not 3 but only 1 additional machine is used.
The total amount of work still needs to be done to complete the task.
Let the new count of days be
Divide both sides by
Set the value of
Thus we have:
This matches option C