Question

Judi is 9 years older than Baz.

Answer 1

I'm going to assume that you want to find Their ages....
Judi's age + Baz's age +Calebs age =64

Lets say Judi's age = j, Baz's age= B, Calebs age= c

J= 9+B,   B= 2c,  C= just c
So, J = 9+2c,   B= 2c,    C= C
 Plug it in, and add like terms
9+2c+2c+c -----> 5c +9
5c+9=64, (isolate c)
5c+9-9 = 64-9 -----> 5c = 55 -----> c=11
 Then plug calebs age everywhere needed.

Calebs age= 11,  Baz's age= 22 Judi's age = 31.

11+22+31 = 64