How many knees do you have?
I have two knees.
How many legs does she have?
She has two legs.
How many arms do you have?
I have two arms.
How many fingers does he have?
He has ten fingers.
How many feet does she have?
She has two feet.
How many toes do you have?
I have ten toes
How many hands do you have?
I have two hands.