average income of 50 families is 3000. Of these average income of 12 families is 1800. Find out the average income of the remaining families

avg inc of f0 fam - 3000
total inc of 50 fam - 3000x50 = 150000
avg inc of 12 fam - 1800
total inc of 12 fam - 1800x12 = 21600
total inc of remaining fams = 150000 - 21600 = 128400
avg in of rem fams = 128400/38 = 3378.94

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Average Income of 50 families             =   3,000
Total Income of 50 families                   =   3,000 * 50
                                                                 =   1,50,000
Average Income of 12 families              =   1,800
Total Income of 12 families                    =   1,800 * 12
                                                                  =   21,600
Remaining families                                 =   38
Total Income of remaining families       =   1,50,000 - 21,600
                                                                  =   1,28,400
Average Income of remaining families =   1,28,400/38
                                                                  =   3,378.94 
                                                                  =   3,379

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