Solution:Let the graduate and post graduate employees be g and p, respectively.
In A,
g + p = 220
and g − p = 4
Solving above equations, we get
g = (220 + 4)/2 = 112
and p = 220 − 112 = 108
Similarly, for others
Companies — Graduate + Post Graduate Employees — Graduate Employees — Post Graduate Employees
A — 220 — 112 — 108
B — 196 — (196 + 2)/2 = 99 — 196 − 99 = 97
C — 224 — (224 + 36)/2 = 130 — 224 − 130 = 94
D — 200 — (200 + 90)/2 = 145 — 200 − 145 = 55
E — 204 — (204 + 96)/2 = 150 — 204 − 150 = 54
Total — 1044 — 636 — 408
Required answer = (99 + 145)/2 − (108 + 54)/2
= 122 − 81 = 41