Answer:
How can you place a pencil on the floor so that no one can jump over it?
What goes up the hill and down the hill, And spite of all, yet stand still?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
Is an older one-hundred dollar bill worth more than a newer one?
10 fish are in a tank. 2 Drown, 4 Swim away, and 3 Die. How many are left?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?