Question

the average monthly income of father and mother is 25,050. the average monthly income of father and son is 42,250 and average monthly income of mother and son is 35200. Find the monthly income of father .

Answer 1

let father's income be X
mother's income be y
son's income be z
((X+y)/2 = 25,050
X+Y=50100
(Y+Z)/2=42,250
Y+Z=84500
(Z+X)/2=35200
Z+X=70400
2*(X+Y+Z) = 205000
X+Y+Z=102500
Y+Z=84500
X=102500-84500
X=18000