Answer: Let's call the present age of Emma x, the present age of Carson y, and the present age of their dad z.
From the information provided we know that:
x + y = (1/2)z + 4
We can find the value of z by isolating it:
x + y = (1/2)z + 4
x + y + 4 = (1/2)z + 4 + 4
x + y + 4 = (1/2)z + 8
2(x + y + 4) = z
We don't know the actual age of Emma, Carson and their dad, we only know the relationship between them.
Explanation: