Final answer:
To find the average age of the other four children, multiply the mean age by the number of children, subtract the total age of the two children from the total age of all six children, and divide the remaining total age by the number of children.
Step-by-step explanation:
To find the average age of the other four children, we can first find the total age of all six children by multiplying the mean age (13 years) by the number of children (6 children). This gives us a total age of 78 years.
Next, we can subtract the total age of the two children (27 years) from the total age of all six children (78 years) to find the total age of the other four children. This gives us a total age of 51 years.
To find the average age of the other four children, we divide the total age (51 years) by the number of children (4 children). This gives us an average age of 12.75 years.