Dear student. Sum of three children is 29. let there present ages be x, y, z years respectively. Then x+y+z=29. Now after 6 years, there ages will be x+6, y+6, z+6 respectvely. Hence sum of ages of children after 6 years=x+6+y+6+z+6=x+y+z+18=29+18=47. Regards