GMAT Data Sufficiency (DS) | Re: In a factory, there are workers, executives, and clerks. How many empl

Let E represent the total number of employees. Let w represent the number of workers, x the number of
executives, and c the number of clerks. Then we have
E = w + x + c (1)
From Statement (1) alone, we have that 41% of the employees E are workers (w), 460 are executives (x),
and the remaining 720 employees are clerks (c). Hence, we have the equations
w = 41/100 E (2)
x = 460 (3)
c = 720 (4)
With equations (1), (2), (3), and (4), we have four different linear equations in four unknowns E, w, x,
...

---