I don’t understand.
A, B, C and D are whole numbers such that
A + B + C = 118
B + C + D = 156
C + D + A = 166
D + A + B = 178
Conclusion I. A is the smallest number and A = 21.
Conclusion II. D is the largest number and D = 88.
Conclusion III. B is the largest number and B = 56.
