The sum of the ages of 6 children is 72, what will be their average in 4 years time?

Let's first find the current average age of the 6 children.

Average age = Sum of ages / Number of children
Average age = 72 / 6
Average age = 12

In 4 years time, each child will be 4 years older. So, the new sum of ages will be:
New sum of ages = 72 + 6 * 4
New sum of ages = 72 + 24
New sum of ages = 96

The new average age in 4 years time will be:
New average age = New sum of ages / Number of children
New average age = 96 / 6
New average age = 16

Therefore, the average age of the 6 children in 4 years time will be 16.

Step 1: Calculate the current average age.

Average current age = Sum of current ages / Number of children
Average current age = 72 / 6 = 12 years

Step 2: Calculate the average age in 4 years.

Average age in 4 years = Average current age + 4 years
Average age in 4 years = 12 + 4 = 16 years

Therefore, the average age of the 6 children in 4 years will be 16 years.