a poster measuring 20 cm× 16 cm is pasted on a sheet of cardboard such that thereis a margin of 3.5 cm along each side of the poster
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20-3.5=16.5
16-3.5=12.5
16.5x12.5x3.5=721.875
16-3.5=12.5
16.5x12.5x3.5=721.875
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