Question 1004727
Call Albert and his father's ages NOW, a and f.
Then we have

f = a + 24
and
f + 8 = 2(a + 8)
Substitute for f in the second and get
a + 24 + 8 = 2(a + 8)
a + 32 = 2a + 16
and 
a = 16
f = 40