Pennsylvania (Pencil-vania).

The man had no umbilical cord; he could not have been born from another.

27

X+Y=10
Y=10-X Use this to substitute for Y
X+Z=20
Z=20-X Use this to substitute for Z.
Y+Z=24 Substitute for Y and Z
(10-X)+(20-X)=24
30-2X=24
-2X=-6
X=3
X+Y=10 Put in value for X.
3+Y=10
Y=7
X+Z=20 Plug in value for X.

3+Z=20
Z=17
CHECK:
Y+Z=24
7+17=24
24=24
X+Y+Z=?
3+7+17=?
27=?
ANSWER: The sum X+Y+Z=27

His plan is to dig the tunnel and pile up the dirt to climb up to the window to escape

485, 1456
(x/2, *3+1, /2, *3+1 …)

A brain.

They are born in different time zones.

Clone.

Traffic light.

2

Were all fictional dogs. Astro on the Jetsons ( he talks), Pluto a Disney character, and Lassie should be well-known to all as a live character, not a cartoon.

The king gave them all fake seeds and the little girl was the only honest child who didn't switch seeds.