An aquarium is in the form of a cuboid whose external measures are 40cm x 20cm x 25cm. The side faces and back faces are to be covered with colored paper. what is the base area of the aquarium?
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Area of paper required = area of base + 2 area of side + area of back
=(80×30)+2(30×40)+(80×40)
=2400+2400+3200
=8000cm
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