The diagram shows a classroom wall in the shape of a trapezium. Diagram NOT accurately drawn Dion wants to paint the classroom wall completely twice. He knows that each tin of paint will cover $$\(12 \mathrm{~m}^{2}\)$$ He is going to have to buy all the paint he needs. Work out the least number of tins of paint that Dion will need to buy. Show your working clearly.

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