The maths teacher asked Little Johnny, "If you have £20 and I ask you for £10 as a loan, how many pounds would you still have?".
"Twenty" came the reply.
"How so?" enquired the teacher.
"Just because you ask me to loan you £10, it doesn't mean I am going to."
"Twenty" came the reply.
"How so?" enquired the teacher.
"Just because you ask me to loan you £10, it doesn't mean I am going to."
