Solution

160327

First name
Amyrah and Hajira
School
Gospel Oak
Country
Age
11

The picture is always in the nine times tables like 18 and 54 would be the same picture. And when both the digits are added in a two digit number...

1+0=1=9 1+1=2=9 1+2=3=9 Etc

The answer never changes because the unit goes up by one on each side every time. The answer only changes when it goes up in the 10s column ( for example, up to 20 ), but the answer is always in the nine times tables. That never changes unless there is a miscalculation.