16
The words mean n/2 - 3 = 5 => n/2 = 8 => n = 16

Because they are always stuffed.

Ad-dress.

485, 1456
(x/2, *3+1, /2, *3+1 …)

5
(X Y X-1 Y-1 X-2 Y-2...)

On day 10 it will reach the top.
(9 + 3) = 12

I must be 23 if my father is twice as old as me.

A donut.

A hat.

Two. ‘A’ & ‘Dictionary’

The letter ‘L’.

Pencil lead.