"Little Johnny" joke

Little Johnny was sitting in class doing math problems when his teacher
picked him to answer a question, "
Johnny, if there were five birds sitting
on a fence and you shot one with your gun, how many would be left?"
"
None,"
replied Johnny, "
cause the rest would fly away."
"
Well, the answer is four,"
said the teacher, "
but I like the way you're
thinking."
Little Johnny says, "
I have a question for you. If there were three
women eating ice cream cones in a shop, one was licking her cone, the
second was biting her cone and the third was sucking her cone, which one
is married?"
"
Well,"
said the teacher nervously, "
I guess the one sucking the cone."
"
No,"
said Little Johnny, "
the one with the wedding ring on her finger,
but I like the way you're thinking."