19, final answer.
Rejoice! Chancellor Healey Will Give Us Cheap Marmalade & Gherkins.
Have you ever been in a film or on television or radio?
a personal comment on this stockpiling
What job would you do now, if you had the choice? (Light hearted)
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Good morning virtual pupils, here is today's problem. No I don't mean those troublemakers, Gilly and Doodle! 
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Many years ago, I had to lie flat for a couple of hours, whilst having a full body scan done. I passed the time, counting how many squares were on the ceiling. ?
The difficulty is that four square ceiling tiles together make one large square, so I kept losing count. The radiographer thought I was mad.
That was a hint to the solution, by the way.
Back to the drawing board, all of you.
Remember the properties of a square: all sides are equal.
There are squares within squares.
Granny Gravy, answers, but no explanations. 
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I was panicking, for a moment I thought I had forgotten to write down the answer!
Oh, you are all so confident! ?
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