Average age of 7 children = 12 years Total ages of 7 children = 12 × 7 = 84 years Age of 1 child who died = 6 years Total ages of remaining 6 children = 84 – 6 = 78 years ∴ Average age of 6 children =
78
6
= 13 years ∴ Average age of 6 children after 5 years = 13 + 5 = 18 years