The maths teacher asked Little Billy "If you have £20 and I ask you for £10 as a

The maths teacher asked Little Billy "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".

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