1.

The average age of 10 children is 14 yearsand the average age of 4 out of then is 12years. Find the average age of remaining 6children.

Answer»

average of 10 children=14×10=140, total average=12×4+6×a; 140=48+6x;; 6x=140-48=92; x=92/6=15.33

avg of 6 children=(total of 10 - total of 4)÷6=140-48)÷6=15.33333...



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